Isolated Torsion of the Fallopian Tube: A Novel Presentation.

Two cases of isolated fallopian tube torsion are presented below. The first case was a 16-year-old sexually inactive female with a 7-day history of right lower abdominal pain and fever (37.8 °C). Laboratory data showed leukocytosis (WBC: 16,500). Pelvic ultrasound revealed a right adnexal mass (13 × 10 mm) without Doppler flow. She underwent emergency laparoscopy, which revealed a necrotic, torsioned right fallopian tube and a normal-appearing ovary. She underwent a laparoscopic right salpingectomy. Histopathological examination demonstrated hematosalpinx causing ischemic changes in the fallopian tube (Figures 1 - 2 , Table 1 ). The second case was a 42-year-old woman evaluated for a two-day history of lower abdominal pain, nausea, and vomiting. She was afebrile with a normal WBC count. Imaging (CT and transvaginal ultrasound) showed a right fallopian tube cystic mass (8 cm) with diminished perfusion. The uterus and ovaries appeared normal. A laparoscopic right salpingectomy for suspected torsion of the fallopian tube was performed. Intraoperatively, the right tube was found to be dark red and twisted. Histological examination confirmed ischemic changes. She had an unremarkable postoperative course and was discharged on the first postoperative day (Figures 3 - 4 ).

Isolated fallopian tube torsion (IFTT) is very uncommon, and such conditions can be classified into two groups: intrinsic causes, such as congenital malformations, hydrosalpinx, pelvic inflammatory disease (PID), and tubal ligation; and extrinsic causes, such as adhesions, endometriosis, tumors, ectopic pregnancy, and trauma. Laparoscopy is the gold standard for diagnosis and management. IFTT is frequently underdiagnosed due to poor clinical presentations and nonspecific imaging findings. Early detection and urgent surgical intervention are important for early management and for preserving fertility and avoiding salpingectomy [ 1 - 5 ].

IFTT continues to be a diagnostic challenge due to its nonspecific symptoms. It should be considered among the etiologies of acute pelvic pain, especially in cases where ovarian torsion is suspected but not confirmed. Imaging studies such as ultrasound and CT scans are important, but laparoscopy is required for definitive diagnosis and treatment. Management primarily aims to preserve fertility whenever possible, but delayed diagnosis often leads to salpingectomy. These cases highlight the importance of increased clinical awareness to reduce diagnostic delay and improve reproductive outcomes [ 4 , 5 ]. The differential diagnosis for IFTT is characterized by nonspecific symptomatology that can mimic various gynecological and non-gynecological conditions. For instance, ovarian torsion, commonly associated with sudden onset of severe pelvic pain, often accompanied by nausea and vomiting, is one differential diagnosis; however, it involves the ovary, whereas ectopic pregnancy involves the fallopian tube. An ectopic pregnancy may also be suspected in the presence of a positive pregnancy test along with lower abdominal pain and vaginal bleeding [ 2 ]. Hemorrhagic ovarian cysts [ 2 ] can cause acute pelvic pain secondary to cyst rupture and hemoperitoneum. Appendicitis often presents with tenderness in the right lower quadrant, accompanied by fever and elevated inflammatory markers [ 4 ]. PID should also be considered, typically causing dull pelvic pain in combination with fever, cervical motion tenderness, and, in some cases, abnormal vaginal discharge [ 5 ]. Lastly, endometriosis-related pelvic pain should be included in the differential diagnosis. While typically presenting as chronic pelvic pain, it may present acutely in cases of endometriomas or deep infiltrating disease [ 5 ].

IFTT is a rare but important cause of acute pelvic pain. Although imaging modalities have improved over the years, early clinical suspicion remains vital for timely diagnosis and management. Laparoscopy is the most common diagnostic and therapeutic method. Considering that delayed diagnosis is common, but tubal preservation is optimal, salpingectomy is often required. These cases highlight the need for early recognition to optimize fertility prospects.