Vaginal clear cell adenocarcinoma in Herlyn-Werner-Wunderlich syndrome: A case report.

The 40-year-old multiparous female patient had a 4-year history of irregular vaginal bleeding. The patient presented to our gynecological department, complaining of irregular vaginal bleeding for 4+ years. Prior to her visit, she had received various medical treatments at different hospitals with minimal improvement. The patient was diagnosed with uterus didelphys during a cesarean section performed 16 years ago. She denied a history of prenatal diethylstilbestrol (DES) exposure. The patient had no significant history of past illness. The patient reported an allergy to cefmetazole and had no significant family medical history. During gynecological examination, an oblique vaginal septum was suspected. The cervix was only partially visualized. Serum tumor markers, including alpha-fetoprotein, carcinoembryonic antigen, carbohydrate antigen (CA) 125, CA19-9 and human chorionic gonadotropin were all within the normal range. The results of a complete blood count were normal. Cervical cytology was performed and was found to be normal. Human papillomavirus 16 was positive. Transvaginal ultrasound revealed uterus didelphys, both uteri anteverted with normal endometrium lining. After surgical excision of the oblique vaginal septum, contrast-enhanced pelvic magnetic resonance imaging (MRI) was performed. The MRI scan showed no obvious lesions in the vagina or paravaginal tissue. The cervix was duplicated and multiple Nabothian cysts. The uterus was didelphic, displaying normal signal intensity and enhancement (Figure 1A ). The ovaries, urethra, bladder, and rectum displayed normal signal characteristics. There was no evidence of enlarged pelvic or inguinal lymph nodes. The left kidney was absent. Imaging of the patient with Herlyn-Werner-Wunderlich syndrome complicated with vaginal clear cell adenocarcinoma. A: Axial T2-weighted magnetic resonance imaging obtained after surgical excision of the oblique vaginal septum demonstrates uterus didelphys with two separate uterine cavities, typical of Herlyn-Werner-Wunderlich syndrome. There are also multiple Nabothian cysts in the cervix; B: Computed tomography scan of the lungs performed 4 years after radical surgery reveals a 1.8 cm nodule located in the anterior segment of the upper lobe of the right lung, suspicious for metastasis (arrow); C: Positron emission tomography/computed tomography scan, also obtained 4 years post-radical surgery, shows increased fluorodeoxyglucose uptake in the right lung nodule, indicative of active metabolic activity and consistent with metastatic disease (arrow).

Clear cell carcinoma of the vagina, stage I; HWW syndrome.

After discharge, the patient continued follow-up at an external hospital. One year post-operation, a follow-up computed tomography (CT) scan revealed a 0.8 cm nodule in the anterior segment of the upper lobe of the right lung. Three years later, the nodule had grown to 1.8 cm (Figure 1B ) and was accompanied by signs of pleural indentation. Positron emission tomography/CT showed high fluorodeoxyglucose uptake in the nodule, indicating malignancy (Figure 1C ). A thoracoscopic wedge resection of the right upper lobe was performed, and the postoperative pathology confirmed metastatic clear cell carcinoma. The patient has been under follow-up for 5 years and currently has no evidence of recurrence or metastasis.

Surgical resection of the vaginal septum was initially performed. During the procedure, a septum was identified along with a 1.0 cm communicating fistula within the septum. Following septal resection, the left cervix and vagina were revealed, and a 2 cm × 1 cm lesion was discovered on the left fornix, left wall of the upper vagina, and the left side of the septum. An excisional biopsy of the lesion was conducted. One month later, after pathological confirmation of vaginal clear cell carcinoma, the patient underwent a radical hysterectomy, vaginectomy, bilateral salpingo-oophorectomy, and pelvic lymph node dissection. A cycle of systemic chemotherapy, comprising 240 mg of paclitaxel and 100 mg of cisplatin, was administered. Subsequently, the patient declined further treatment due to significant side effects and discomfort. Clear cell adenocarcinoma of the upper vagina was identified, originating from the malignant transformation of vaginal adenosis (Figure 2 ). The lesion was confined within the vaginal wall and extended to the fornix and the surgical margin. It did not involve the paravaginal or paracervical tissues on either side, the lateral pelvic walls, or the adnexa bilaterally. Examined lymph nodes showed reactive hyperplasia without any evidence of metastatic cancer. Immunohistochemical results were as follows: Napsin A+++, CD15++, P16+++, P53-, WT-1-, PAX-8+++, ER-, PR-, CEA- and Ki67 with a positivity rate of 45%. Hematoxylin and eosin staining (× 40) of the patient's resected vaginal tissue. The image shows benign glands (arrow) adjacent to clear cell adenocarcinoma (short arrows), indicating malignant transformation of vaginal adenosis (arrows).

Our case highlights the risk of cervico-vaginal adenocarcinomas in patients with HWW syndrome and the challenges in detecting and treating such malignancies. Although these occurrences are exceedingly rare, they tend to manifest on the obstructed side, which is often occult and difficult to detect. This can significantly hinder timely diagnosis and treatment. Therefore, it is crucial for patients with HWW syndrome to have their septum resected upon diagnosis, including those with communicating fistulas. For patients whose obstructions are not surgically corrected, regular imaging evaluations of the cervix and vagina, particularly using MRI, should be implemented to facilitate early detection and management. Tailored management with routine imaging and early surgical intervention may improve outcomes in these rare but complex cases, and should be incorporated into clinical practice when managing HWW syndrome.

This report describes vaginal clear cell adenocarcinoma in a patient with HWW syndrome. Given the related origins of cervical and vaginal adenocarcinomas, we summarized 13 cases of primary cervical or vaginal carcinoma in HWW syndrome reported in the English literature to explore this rare entity (Table 1 )[ 5 - 12 ]. Summary of primary cervical or vaginal carcinoma in Herlyn-Werner-Wunderlich syndrome AC: Adenocarcinoma; EAC: Endometrioid adenocarcinoma; CCA: Clear cell adenocarcinoma; NED: No evidence of disease; DOD: Died of disease; DES: Diethylstilbestrol. The average age of the patients was 37 years (range, 20-69 years). Among the 9 patients with available data on parity, 8 had delivered. Based on the patients’ age and delivery history, as well as intra-operative findings in some cases[ 7 - 9 , 11 , 12 ], these patients were most likely suffering from communicant HWW syndrome. Non-communicant HWW syndrome usually has earlier onset and more acute and severe symptoms, such as acute abdominal pain. Therefore, these patients can usually receive timely treatment and relief of obstruction[ 1 , 2 ]. In contrast, communicant HWW syndrome has more chronic and tolerable symptoms, such as irregular vaginal bleeding[ 1 , 2 ], which may lead to the disease being neglected until complications arise, such as endometriosis and cervico-vaginal carcinoma, as observed in these 13 patients. The primary symptom was vaginal bleeding, either irregular or post-menopausal bleeding; additionally, 2 patients had menorrhagia and 1 patient had vaginal pain. Irregular vaginal bleeding is a common yet nonspecific symptom for both cervico-vaginal carcinoma and HWW syndrome. Consequently, it might lead to a delayed diagnosis of carcinoma complicated with HWW syndrome[ 10 ]. Of these 13 patients, 9 had cervical carcinoma, and 4 had vaginal carcinoma, with staging from I to IV. Histopathologically, all 13 patients had adenocarcinoma, including 7 with clear cell adenocarcinoma, 4 with adenocarcinoma and 2 with endometroid adenocarcinoma. This is different to patients without Müllerian duct anomalies. For the general population, adenocarcinoma only accounts for 8%-10% of primary vaginal malignancies[ 13 ] and 10-25% of all cervical carcinomas[ 14 ]. This aligns with previous research by Zong et al [ 10 ], suggesting that congenital Müllerian duct anomalies may be linked to an increased risk of cervico-vaginal adenocarcinoma. One possible explanation for this correlation is that Müllerian duct anomalies are associated with vaginal or cervical adenosis, which have persisted for a long time and are subject to genetic and hormonal changes[ 9 , 10 ]. Both our case and the case reported by Uehara et al [ 12 ] had vaginal adenosis. Furthermore, a study of 27 patients with HWW syndrome found vaginal adenosis in 8 of the resected septa (29.6%)[ 15 ]. Although prenatal DES exposure is strongly associated with an increased risk of vaginal adenosis and vaginal clear cell adenocarcinoma[ 16 , 17 ], none of the 6 patients with available data on DES exposure reported being exposed to DES[ 8 , 9 , 11 , 12 ]. Of the 9 patients for whom data on tumor location were available, eight tumors were found on the obstructed side[ 6 - 9 , 11 - 13 ], while only one was found on the non-obstructed side[ 5 ]. Cervico-vaginal carcinomas on the obstructed side in patients with HWW syndrome are occult, particularly in those not previously diagnosed with the syndrome. Consequently, by the time these tumors are diagnosed, they may have reached an advanced stage or become inoperable[ 6 , 8 , 10 , 11 ]. Additionally, carcinomas on the obstructed side are difficult to detect, which can only be identified after the vaginal septum has been removed. Therefore, it is recommended that patients with HWW syndrome undergo septum resection upon diagnosis, even those with communications. For patients where obstructions are not surgically corrected, regular imaging evaluations of the cervix and vagina on the obstructed side should be conducted. Given its excellent tissue contrast and ability to evaluate both complex Müllerian duct anomalies and cervico-vaginal lesions, MRI should be considered the imaging modality of choice in the follow-up of these patients[ 1 ]. Once diagnosed, the treatment for cervico-vaginal adenocarcinomas in patients with HWW syndrome generally follows similar protocols to those for patients without congenital anomalies. However, anatomical abnormalities associated with HWW syndrome may increase the risks linked to surgical procedures and complicate the administration of radiation therapy[ 6 , 18 ]. For instance, the use of intracavitary brachytherapy (ICBT) in such patients can be particularly challenging due to anatomical distortion and the discomfort caused by applicator placement. It is recommended that ICBT be performed under anesthesia and with alternative techniques, such as the mold technique, in these cases to alleviate pain and ensure accurate treatment[ 6 , 18 ]. Early intervention through regular imaging, particularly with MRI, may also facilitate earlier detection of malignancies, potentially leading to better outcomes. The impact of congenital anomalies on the prognosis of cervico-vaginal adenocarcinoma remains unclear due to the limited number of reported cases. Among the 10 patients with follow-up data, monitored over a period of 1-5 years, three died due to the disease, six showed no evidence of disease recurrence[ 5 - 8 , 10 ], and the present patient underwent successful resection of lung metastasis and has shown no signs of disease since then. Although this case demonstrates the potential for long-term survival even after metastasis, the variability in outcomes suggests that earlier diagnosis and tailored treatment strategies could be crucial for improving prognosis.

Herlyn-Werner-Wunderlich (HWW) syndrome is a complex genitourinary disorder characterized by a constellation of anatomical anomalies, primarily reported as uterus didelphys, oblique vaginal septum with obstructed hemivagina, and ipsilateral renal agenesis[ 1 - 3 ]. This syndrome constitutes a minor proportion of Müllerian duct anomalies and is exceedingly rare[ 4 ]. The incidence of primary cervico-vaginal carcinomas, particularly vaginal carcinoma, in patients with HWW syndrome is extremely low and has only been documented in case reports[ 5 - 12 ]. The potential for malignancy in these patients may be overlooked due to the complexity of concurrent anatomical abnormalities, posing a unique diagnostic and therapeutic challenge. Recognizing this rare association is crucial for clinicians, particularly gynecologists and oncologists, as it underscores the need for vigilant screening, tailored diagnostic protocols, and timely intervention in managing such rare but clinically significant cases.