Abdominal wall endometriosis: experience of the General Surgery Service of the Antônio Pedro University Hospital of the Universidade Federal Fluminense

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Col. Bras. Cir. 47 • 2020 • https://doi.org/10.1590/0100-6991e-20202544 link copy Abdominal wall endometriosis: experience of the General Surgery Service of the Antônio Pedro University Hospital of the Universidade Federal Fluminense Authorship SCIMAGO INSTITUTIONS RANKINGS ABSTRACT Objective: to study the characteristics of women undergoing abdominal surgery with suspected abdominal wall endometriosis or abdominal wall tumor, and to assess the association with age, race and previous cesarean delivery. Method: retrospective and analytical study carried out from January 2000 to December 2019, at the General Surgery Service of Hospital Universitário Antônio Pedro (HUAP) at Universidade Federal Fluminense (UFF). Medical records of 100 patients with abdominal wall endometriosis and other types of abdominal wall tumors were analyzed. Age, color, previous history of cesarean section or abdominal surgery and histopathological data were verified. The patients were classified as young adults (aged between 18 and 28 years and 11 months) and adults. The SPSS program was used for data analysis, Fisher’s test with a significance level of 0.05 . Results: abdominal wall endometriosis with histopathological confirmation was found in 22%, the mean age was 52.28 ± 18.66 which was lower when compared to other diagnoses. There was an association between previous cesarean section and abdominal wall endometriosis (p <0.005). Conclusion: the women with a diagnosis of abdominal wall endometriosis had undergone previous cesareans (the majority) and were in an active reproductive age. Although the brown skin women were the most frequent, there was no statistical difference. Keywords: Endometriosis; Abdominal Wall; General Surgery RESUMO Objetivo: estudar o perfil das mulheres submetidas a cirurgia abdominal com suspeita de endometriose de parede abdominal ou tumor de parede abdominal e analisar a associação com a faixa etária, cor e cesariana prévia. Métodos: estudo retrospectivo e analítico realizado no período de janeiro de 2000 a dezembro de 2019, no Serviço de Cirurgia Geral do Hospital Universitário Antônio Pedro (HUAP) da Universidade Federal Fluminense (UFF). Analisaram-se prontuários de 100 pacientes com endometriose de parede abdominal e com outros tipos de tumoração de parede abdominal. Idade, cor, histórico prévio de cesariana ou cirurgia abdominal e resultado histopatológico foram avaliados. As pacientes foram classificadas em adultas jovem (idade entre 18 e 28 anos e 11 meses) e adultas. Utilizou-se para a análise dos dados o programa SPSS e, teste de Fisher com nível de significância de 0,05. Resultados: Endometriose de parede abdominal com confirmação histopatológica foi encontrada em 22% dos casos. A média de idade foi 52.28 ±18,66, menor quando comparada a outros diagnósticos. Observou-se associação entre cesariana prévia e endometriose de parede abdominal (p<0,005). Conclusão: as mulheres atendidas pelo Setor de Cirurgia da UFF com diagnóstico de endometriose de parede abdominal, na maioria, realizaram cesariana prévia e estavam em idade ativa, reprodutiva. Apesar da cor parda ter sido mais frequente, não se observou diferença estatística. Palavras chave: Endometriose; Parede Abdominal; Cirurgia INTRODUCTION Abdominal wall endometriosis is a rare disease 1 characterized by the presence of endometrial tissue in any segment or depth of the abdominal wall, that is, outside the endometrium and myometrium. The extra pelvic location is less recurrent than the pelvic one, and has already been observed in the most varied organs and systems, such as lungs, bronchi, pleura, gallbladder, kidney, bladder, small intestine, large intestine, cecal appendix, oments, lymph nodes, and subarachnoid space 2 - 4 . Endometriosis usually affects women in the reproductive age group, with a maximum incidence in the third and fourth decades 5 . Its incidence is deemed higher in young women aged between 18 and 29 years old 6 , 7 Ectopic endometrial foci are usually under the influence of ovarian hormones, displaying all changes of the menstrual cycle, including bleeding. The malignant transformation of endometriosis is rare, but it cannot be ruled out 8 . A study carried out in 2007 showed that early hysterotomy, associated with interrupted pregnancy using the procedure known as microcesarean section, is highly related to the development of endometriosis when compared with cesarean section performed at the end of pregnancy 9 . This factor is directly associated with the theory that the endometrium of early pregnancy is more favorable for the development of endometriosis than the endometrium of late pregnancy 10 . When in the abdominal wall, endometriosis is preferably located close to a surgical scar. Although in most cases it occurs in patients with previous cesarean section 11 , 12 , it has also been observed in postoperative, conventional or laparoscopic, hysterectomy 13 , 14 , appendectomy and inguinal hernia incisions, and it has been described in patients without any previous intervention 15 . The classic symptomatology of abdominal wall endometriosis consists of a tumor that is very sensitive to palpation, intermittently painful, which increases in volume and sensitivity according to the phase of the menstrual cycle. Regarding pathogenesis, no theory can fully explain the exact mechanism of formation of abdominal wall endometriosis, and it is likely to result from a combination of events. However, two theories suggest that the occurrence of abdominal wall endometriosis 16 , the most accepted being the hypothesis of contamination of the abdominal wall, particularly during uterine-opening procedures 8 , 17 . The other would be the occurrence of reflux, through the fallopian tubes, of particles from the endometrium to the abdominal cavity and blood and lymphatic vessels 8 , 17 . Another possibility would be the presence of primitive multipotential cells outside the uterus that under certain conditions would produce endometriosis, which would explain the presence of abdominal wall endometriosis in individuals who have not undergone previous surgery 5 , 17 , 18 . As signs and symptoms, we can highlight the presence of a tumor in the abdominal wall that increases in volume and causes pain, especially in the menstrual period 8 , 19 . In fact, the diagnostic suspicion must occur when the signs and symptoms clearly coincide with the phases of the menstrual period 20 , 21 . However, this relationship is not always clearly present, thus making it difficult to establish the cause of the problem. In this sense, it is important to establish a differential diagnosis with the following tumors: sarcomas, metastatic carcinomas, hernias, hematomas and granulomas, among others. It is noteworthy that the clear relationship between signs and symptoms and menstruation can favor the correct diagnostic impression of endometriosis 8 , 22 . It is also worth mentioning that there is usually an influence of ovarian hormones, which promote changes associated with the menstrual cycle, including bleeding 8 , 22 . The treatment of abdominal wall endometriosis is essentially surgical and its main objective is the complete resection of the tumor, since no remaining endometrial tissue should remain in the affected area 8 , 23 . Therefore, the excision must be wide to remove all skin segments, subcutaneous tissue, muscles, aponeuroses and peritoneum potentially involved 2 , 24 - 27 . The literature recommends that the defect created by the extended excision be corrected with the abdominal muscles and aponeuroses, when possible. However, when this implies some tension in the suture lines, the most used option is a polypropylene prosthesis 8 , 28 . It is worth mentioning that in abdominal wall endometriosis, when there is an infiltration above 5 mm of the wall’s depth involving the parietal peritoneum, there may be severe postoperative complications 29 - 31 . This is a well-known clinical entity in the gynecological literature, though it is still not well understood among general surgeons 8 . In this sense, as there is no safe clinical marker, the diagnosis occurs through histopathological analysis of a sample collected from an invasive procedure. Therefore, it is important to outline the characteristics of individuals with this disease in order to contribute to the diagnosis. It is believed that the incidence of abdominal wall endometriosis is higher in young women aged between 18 and 29 years 6 , 7 . Thus, the objective of this study is to report the experience of 22 cases of abdominal wall endometriosis, elucidating the importance of the surgical treatment used, in addition to highlighting the characteristics of women with this condition attended by the General Surgery Service of the Antônio Pedro University Hospital of the Universidade Federal Fluminense, and to observe the association with age, color and previous cesarean section. METHODS We conducted a descriptive, retrospective, quantitative study at the General Surgery Service of the Antônio Pedro University Hospital of the Universidade Federal Fluminense - HUAP/UFF, located at Rua Marquês de Paraná, 303, Centro, Niterói, RJ, Brazil. We collected data collection based on documentary research, through consultations with the medical records of the Medical Documentation Sector of HUAP. The variables used in this study were year of search in the sector, age, color, diagnosis of abdominal wall endometriosis, previous cesarean section, and histopathological result of the specimens, used only to confirm abdominal wall endometriosis. In addition, we classified patients according to age in young adults (aged between 18 and 28 years and 11 months) and adults (over 29 years) 6 , 7 . We defined the sample size by convenience, therefore using no calculation for it. With the aid of the SISAIH 01 software, we searched ICDs of abdominal wall diseases. In addition, we performed a search in the Anatomopathology Sector of HUAP/UFF to obtain the desired records. We thus selected 100 patients, observing the cases of abdominal wall endometriosis and other types of abdominal wall tumors, to assess the incidence or absence of cases and their relationship with the variables studied. Therefore, the individuals did not undergo any personal intervention or interview. We collected data form medical records of patients who had a clinical picture of abdominal wall endometriosis and other types of tumors of the abdominal wall. The period of data collection was from January 2000 until December 2019. Inclusion criteria were female patients, submitted to endometriosis surgery confirmed by histopathological examination or to resection of other abdominal wall tumors. The exclusion criteria were female patients diagnosed with incisional and non-incarcerated (reducible) hernias and intra-abdominal diseases giving a palpable mass effect. The work was evaluated and approved by the Ethics in Research Committee of UFF on May 24, 2019 (Survey Protocol 12123219.1.0000.5243). Due to the study’s retrospective nature, there was a waiver of the Informed Consent Form (ICF). DATA ANALYSIS We submitted the collected data to statistical analysis using the IBM SPSS software, version 20.0. We assessed normality of the age variable with the Kolmogorov-Smirnov test and expressed it as mean ± standard deviation when there was a normal distribution and as median and range otherwise. We presented the other results related to color, previous cesarean section, age group, and diagnosis as frequency and percentage. To compare cases according to age, we used the Student’s t-test in case of normal distribution and the Mann-Whitney test otherwise. We applied the Fisher’s exact test to analyze the association between the endometriosis diagnosis and color, age, and previous cesarean section of. The level of significance was p < 0.05. RESULTS Table 1 shows the characteristics of the studied patients. The average age of women was 33.23 years, the majority being adults (81.8%). In addition, there was a higher prevalence of mixed races (54.5%) and of previous cesarean sections (95.5%). Thumbnail Table 1 Characteristics of the patients included in the study. *12 medical charts did not record the color. Of the evaluated cases, 22 had abdominal wall endometriosis. Table 2 shows the clinical data, diagnostic method, treatment, and postoperative evolution. The age ranged between 26 and 40 years (mean 33.23) and 21 patients had undergone previous cesarean section. Regarding the duration of signs and symptoms, the average was 2.66 years, ranging from 6 months to 7 years. Thumbnail Table 2 Characteristics of patients diagnosed with abdominal wall endometriosis. The main complaint in all cases was a tumor on the abdominal wall that increased in volume and became more painful with the beginning of the menstrual period. The tumor was located in the iliac fossa in 18 patients (eight on the right and 10 on the left), and in the left flank in one. All were located near the cesarean section surgical scar. In three cases, it was located in the umbilical region. All had, at palpation, imprecise limits, smooth consistency, and increased sensitivity. Twenty women underwent ultrasonography, and 14, computed tomography. In three tomographic exams, the tumor captured contrast (only one patient was menstruating during the exam). In all cases, there was extensive excision of the tumor and adjacent affected tissues ( Figure 1 ). In six cases, a polypropylene mesh was necessary to the reconstruction of the abdominal wall, associated with drainage by active aspiration for 48 hours on two occasions. Figure 1 Stages of surgery with wide excision. After the follow-up until the outpatient discharge, the postoperative evolution of the patients was satisfactory and effective, with no recurrence or complication, in addition to improvement in pain, discomfort and tumor. In addition, the histopathological examination of the specimens confirmed the preoperative diagnostic impression of endometriosis in all cases. Figure 2 shows the age distribution according to the diagnosis found. We found that women with abdominal wall endometriosis have a lower average age (33.23 ± 4.46 years with endometriosis versus 57.65 ± 17.59 years without it, p = 0.0001). Figure 2 Age distribution according to diagnosis. However, analysis of endometriosis according to age showed no significant difference. In fact, women with endometriosis were younger, but we found the highest frequency in the age group considered adult, no in the young adult one ( Table 3 ). Table 3 also shows the association between endometriosis and color. We observed no significant difference between them. Regarding previous cesarean section, we found an association with endometriosis, that is, the majority (95%) of women with endometriosis underwent previous cesarean section ( Table 3 ). Thumbnail Table 3 Association between age group and abdominal wall endometriosis. DISCUSSION Endometriosis is a well-known disease in gynecological literature, but it is still not well understood among general surgeons 8 . In this study, we observed that patients with abdominal wall endometriosis had lower age compared with the ones with other diagnoses, and had undergone prior caesarean section. Thus, we could infer that abdominal wall endometriosis is related to previous cesarean section. As we can see from the analysis of results, abdominal wall endometriosis generally affects women in the reproductive age group, with maximum incidence in the third and fourth decades 5 , 32 . The average age of individuals diagnosed with abdominal wall endometriosis was 33.23 years, similar to what was found by Khamechian, Alizargar, and Mazoochi (2014) 33 , Khan et al. (2017) 34 , Yela et al. (2017) 35 , Satyanarayana et al. (2018) 36 , Marras et al. (2019) 37 , Ramos-Mayo & Gil-Galindo (2019) 38 , and Zhang et al. (2019) 12 . This age represents the stage in which the woman is reproductively active, initially described by Chun, Nelson and Maull (1990) 24 and also found in more recent studies 12 , 35 , 38 . However, we found no association between abdominal wall endometriosis and the age group of young adults; in fact, there were more adult women (88%). When comparing the mean ages, Khan et al. (2017) 34 found no significant difference between groups, contrary to our findings, in which patients with abdominal wall endometriosis diagnosis were younger. Although the majority of women are brown, we did not observe a significant difference in the association of color with abdominal wall endometriosis. There are no studies in the literature addressing this issue. We observed an association between the diagnosis of abdominal wall endometriosis and prior cesarean section, present in 21% of the sample. In addition, among women with the condition, the percentage of prior cesarean section increased to 95%, that is, of the 22 cases of endometriosis, 21 had undergone the procedure. This factor is well described in the literature, since endometrial tissue can be transported to the scar or adjacent tissues during surgery 12 , 33 - 43 . There was only one case in the present series with history of vaginal delivery, hence no previous operation. Horton et al. (2008) 40 carried out a review containing 455 cases of abdominal wall endometriosis and showed that 57% of the cases were associated with cesarean delivery, also elucidating relationships with hysterectomy (11%) and other operations (13%). Khamechian, Alizargarl and Mazoochi (2014) 33 studied 30 women diagnosed with abdominal wall endometriosis and showed that all had delivered by cesarean section. Ecker et al. (2014) 42 reported cases of abdominal wall endometriosis from experience of 12 years at an academic institute. They observed that of the 65 patients, 91.5% had undergone prior cesarean section and only six had never undergone any operation. Oh et al. (2014) 41 carried out a case study with nine patients and observed that six participants had undergone a previous cesarean section. This study also emphasized the importance of using an image exam to help in the diagnosis. In 2017, a study conducted at the State University of Campinas (São Paulo State, Brazil), evaluated cases of abdominal wall endometriosis over a 10-year period. They observed that 94% had undergone a previous cesarean section, 98% of whom felt pain and 36.5% had a tumor 35 . Celik et al. (2019) 39 carried out a study with 53 patients, observing 49 cases of previous cesarean section, which represents approximately 92% of the cases. They also noted that this diagnosis has become common, due to the increase in cesarean rates. Khan et al. (2017) 34 investigated the risk factors of women who underwent endometriosis abdominal wall resection and found that 88.2% had previous cesarean section. They also highlighted that 94.1% had undergone laparotomy. Satyanarayana et al. (2018) 36 studied 29 cases with endometriosis and found 16 cases associated with previous cesarean section, and in 56.25% the lesion was located close to the scar. Marras et al. (2019) 37 carried out a retrospective, observational study lasting 11 years and included 37 women with abdominal wall endometriosis. They elucidated that, as for prior operations, 65.7% had undergone a caesarean section. Zhang et al. (2019) 12 , in a study with 198 cases of endometriosis in the cesarean scar, found that all patients had undergone previous cesarean section. They also observed that 98.5% had abdominal mass and 86.9% reported pain. Wasfie et al. (2002) 11 reported that when endometriosis occurs in the abdominal region, it is preferably located close to or in a surgical scar. In accordance with these authors’ findings corroborating ours, it is worth mentioning that one of the main risk factors for abdominal wall endometriosis is cesarean section. Grigore et al. (2017) 44 confirmed the importance of reassessing the best surgical method and care during the procedure, these even being prophylactic methods. Wasfie et al. (2002) 11 recommended vigorous wound postoperative irrigation with saline before closure of the abdominal wall. Koger et al. (1993) 2 , Patterson & Winburn (1999) 25 and Calabrese et al. (1997) 45 also defend aspiration biopsy with a fine needle, which, according to the present study, would be contraindicated due to the possibility of spreading the disease in healthy tissues along the puncture path. There are no reports in the literature on the association between abdominal wall endometriosis and multiple cesarean sections. However, Solak et al. (2013) 43 observed a strong association between the number of cesarean sections and size of the tumor, as they found large ones (4.1 cm diameter) mainly in women previously subjected to 2 to 4 cesarean procedures, and the smaller ones (1.9 cm in diameter) in women who had undergone 1 to 2 c-sections. It is also worth mentioning the association with the body mass index. Khan et al. (2017) 34 showed that the mean BMI was higher in women who were diagnosed with abdominal wall endometriosis (29.2 ± 6.6 kg/m² in cases vs. 26.4 ± 8.8 kg/m² in controls), justifying this finding by increased surgical difficulty occurring in obese patients, mainly related to suboptimal closure of the uterus after incision. Corroborating this finding, Marras et al. (2019) 37 observed, in 35 patients with endometriosis, 54.3% overweight (body mass index above 24.9 kg/m²). In addition, Celik et al. (2019) 39 observed an average of 25.5 ± 3.5 kg/m², that is, a value that is also considered to be overweight. In order to provide more data for the collaboration of diagnosis and therapeutic conduct in the face of abdominal wall endometriosis, further studies would be necessary. A recent study by Azhar et al. (2019) 46 shows what was initially diagnosed as inguinal hernia and, after histopathology, confirmed to be endometriosis. The authors thus stressed the importance of differential diagnosis of endometriosis in women of reproductive age with or without a history of endometriosis, especially in post-cesarean section patients. In addition, the classic symptoms of abdominal wall endometriosis consist of a tumor with high sensitivity to palpation, intermittently painful, which increases in volume and sensitivity according to the phase of the menstrual cycle 8 . In the present series, patients’ postoperative evolution was satisfactory, with no recurrence. Thus, these factors contributed to improve pain, discomfort and tumor. Diagnostic suspicion must always be raised when the signs and symptoms clearly coincide with the phases of the menstrual period. However, this relationship is not always clear, which hinders the determination of the condition’s etiology 8 . Thus, it is important to consider the differential diagnosis with the following tumors: sarcomas, metastatic carcinoma, hernias, bruises and granulomas, among others. In the present study, we observed a clear relationship between signs and symptoms and menstruation, which favored the correct diagnostic impression of endometriosis, later confirmed by histopathological examination. The treatment of endometriosis of the abdominal wall is essentially surgical and its main objective is complete resection, since no endometrial tissue should remain in the affected area. Thus, the excision must be broad so that there is complete removal of all potentially involved skin segments, subcutaneous tissue, muscles, aponeuroses and peritoneum 2 , 24 , 26 , 27 , 47 . The defect created by the extended excision must be corrected with the abdominal muscles and aponeuroses. However, when there is tension in the suture lines, a polypropylene prosthesis is the most used 8 . There is a need for more detailed studies regarding the analysis of the number of children and cesarean sections, to assess whether there is an influence on the size of the tumor. The association with previous laparotomy and hysterectomy, as well as with the nutritional status of these patients, also need better elucidation. In short, abdominal wall endometriosis is a rare condition that causes, presenting a diagnosis based on histopathological analysis. Treatment is essentially surgical and its main objective is the complete resection of the lesion. We observed that all patients presented a satisfactory postoperative evolution and elucidated the relationship between previous cesarean section and abdominal wall endometriosis in women of reproductive age. REFERENCES 1 Rindos NB, Mansuria S. Diagnosis and management of abdominal wall endometriosis: a systematic review and clinical recommendations. Obstet Gynecol Surv. 2017;72(2):116-22. 2 Koger KE, Shatney CH, Hodge K, McClenathan JH. Surgical scar endometrioma. Surg Gynecol Obstet. 1993;177(3):243-6. 3 Healy JT, Wilkinson NW, Sawyer M. Abdominal wall endometrioma in a laparoscopic trocar tract: a case report. 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Publication Dates Publication in this collection 18 Sept 2020 Date of issue 2020 History Received 27 Mar 2020 Accepted 14 Apr 2020 This is an open-access article distributed under the terms of the Creative Commons Attribution License Authorship .author-card { border-bottom: 1px solid #ccc; padding: 1rem 0; } .author-card:last-child { border-bottom: 0px; } .author-name { font-weight: 600; } .orcid-button { padding-left: 2.5rem; } .modal-body { padding-bottom: 3rem; } .orcid-button::before { content: ""; position: absolute; background-image: url(https://ds.scielo.org/img/logo-orcid.svg); background-repeat: no-repeat; background-size: 1.5em auto; background-position: .5em center; display: block; width: 60px; height: 60px; top: -10px; left: 0; } person JORGE EDUARDO FARIA ROCHA COSTA school - Universidade Federal Fluminense, Faculdade de Medicina, Curso de Pós-Graduação, Mestrado Profissional em Saúde Materno Infantil - Niterói - RJ - Brasil Universidade Federal Fluminense Brazil Niterói, RJ, Brazil - Universidade Federal Fluminense, Faculdade de Medicina, Curso de Pós-Graduação, Mestrado Profissional em Saúde Materno Infantil - Niterói - RJ - Brasil 0000-0003-2884-3934 person ITALO ACCETTA ECBC-RJ school - Universidade Federal Fluminense, Faculdade de Medicina, Departamento de Cirurgia - Niterói - RJ - Brasil Universidade Federal Fluminense Brazil Niterói, RJ, Brazil - Universidade Federal Fluminense, Faculdade de Medicina, Departamento de Cirurgia - Niterói - RJ - Brasil person FRANCISCO JOSÉ SANTOS MAIA school - Universidade Federal Fluminense, Faculdade de Medicina, Departamento de Cirurgia - Niterói - RJ - Brasil Universidade Federal Fluminense Brazil Niterói, RJ, Brazil - Universidade Federal Fluminense, Faculdade de Medicina, Departamento de Cirurgia - Niterói - RJ - Brasil person RENATO AUGUSTO MOREIRA DE SÁ school - Universidade Federal Fluminense, Faculdade de Medicina, Departamento Materno Infantil - Niterói - RJ - Brasil Universidade Federal Fluminense Brazil Niterói, RJ, Brazil - Universidade Federal Fluminense, Faculdade de Medicina, Departamento Materno Infantil - Niterói - RJ - Brasil Mailing address: Jorge Eduardo Faria Rocha Costa E-mail: [email protected] Conflict of interest: no. SCIMAGO INSTITUTIONS RANKINGS - Universidade Federal Fluminense, Faculdade de Medicina, Curso de Pós-Graduação, Mestrado Profissional em Saúde Materno Infantil - Niterói - RJ - Brasil Universidade Federal Fluminense Brazil Niterói, RJ, Brazil - Universidade Federal Fluminense, Faculdade de Medicina, Curso de Pós-Graduação, Mestrado Profissional em Saúde Materno Infantil - Niterói - RJ - Brasil - Universidade Federal Fluminense, Faculdade de Medicina, Departamento de Cirurgia - Niterói - RJ - Brasil Universidade Federal Fluminense Brazil Niterói, RJ, Brazil - Universidade Federal Fluminense, Faculdade de Medicina, Departamento de Cirurgia - Niterói - RJ - Brasil - Universidade Federal Fluminense, Faculdade de Medicina, Departamento Materno Infantil - Niterói - RJ - Brasil Universidade Federal Fluminense Brazil Niterói, RJ, Brazil - Universidade Federal Fluminense, Faculdade de Medicina, Departamento Materno Infantil - Niterói - RJ - Brasil Figures | Tables Figures (2) Tables (3) Thumbnail Figure 1 Stages of surgery with wide excision. Thumbnail Figure 2 Age distribution according to diagnosis. Thumbnail Table 1 Characteristics of the patients included in the study. Thumbnail Table 2 Characteristics of patients diagnosed with abdominal wall endometriosis. Thumbnail Table 3 Association between age group and abdominal wall endometriosis. image Figure 1 Stages of surgery with wide excision. open_in_new Source: Authors. image Figure 2 Age distribution according to diagnosis. open_in_new * p <0.05, Student t-test. table_chart Table 1 Characteristics of the patients included in the study. Results Age, mean ± standard deviation 52.28 ± 18.66 Young adult, n (%) 12 (12%) Adult, n (%) 88 (88%) Color* White 29 (33%) Brown 53 (60%) Black 6 (7%) Previous cesarean section Yes 45 (%) Not 55 (55%) Abdominal wall endometriosis Yes 22 (22%) Not 78 (78%) table_chart Table 2 Characteristics of patients diagnosed with abdominal wall endometriosis. Case Age Previous cesarean section Symptom time (years) Location Image exam Treatment Postoperative evolution 1 31 Yes 1.5 RIF US; TC Wide excision + mash Good 2 33 Yes 1 LIF US; TC Wide excision + mash Good 3 29 Yes 2 RIF US; TC Wide excision Good 4 40 No 1 Umb. Scar - Wide excision Good 5 35 Yes 3 RIF US; TC Wide excision Good 6 28 Yes 3 LIF US; TC Wide excision Good 7 35 Yes 1 LIF US Wide excision Good 8 40 Yes 1 Umb. Scar US Wide excision Good 9 26 Yes 7 RIF US Wide excision Good 10 28 Yes 7.5 LIF US Wide excision + mash Good 11 32 Yes 3 LIF US; TC Wide excision + mash Good 12 39 Yes 7 LIF US; TC Wide excision Good 13 40 Yes 0.5 RIF US; TC Wide excision Good 14 32 Yes 1 LIF US; TC Wide excision Good 15 32 Yes 2 LIF US Wide excision + mash Good 16 30 Yes 4 RIF US; TC Wide excision Good 17 34 Yes 1 LIF US; TC Wide excision Good 18 32 Yes 2 Umb. Scar - Wide excision Good 19 38 Yes 3 LIF US; TC Wide excision + mash Good 20 28 Yes 2 LIF US; TC Wide excision Good 21 30 Yes 2 RIF US; TC Wide excision Good 22 39 Yes 3 RIF US Wide excision Good RIF: right iliac fossa; LIF: left iliac fossa; LF: left flank; Umb. Scar: umbilical scar; US: ultrasound; CT: computed tomography. table_chart Table 3 Association between age group and abdominal wall endometriosis. Abdominal wall endometriosis Variables p-value Yes No Young adults 5 7 0.130 Adults 17 71 Yes No White 9 20 0,143 Brown 12 41 Black 1 5 Yes No Previous cesarean section 21 24 0,0001* No previous cesarean section 1 54 *p <0.05, Fisher’s exact test. 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