Isolated Fallopian Tube Torsion with Fimbrial Cyst in a Pregnant Woman: A case Report

Background: Among diseases causing acute lower abdominal pain in women, isolated fallopian tube torsion is a rare cause that occurs mainly in women of reproductive ages and if left untreated can lead to fertility problems. Immediate diagnosis and timely surgery are urgent and necessary to preserve the fertility of females. Successful pregnancy with simultaneous involvement of isolated fallopian tube torsion is one of the rare operations in the world. Case Presentation: The reported case is a 37-year-old pregnant woman (Gravid 2, with 33-week gestational age) with nausea, vomiting and abdominal pain in August 2020 who presented to the Maryam Hospital in Karaj in August 2020. The patient was examined in the operating room under anesthesia, and pain in the right and lower abdomen was observed. There was no anorexia, and on examination, there was severe tenderness in the right lower quadrant (RLQ) area. There was no pain in other parts of the abdomen. Ultrasonography in the patient's tenderness showed an image of a tubular and cystic structure measuring 30×10 mm. In CBC test, leukocytosis with high PMN (Polymorphonuclear), (WBC: 11700 mm3 and Neutrophil: 78%) was observed. During laparotomy, isolated torsion of the right fallopian tube observed, half of which was cyanotic. Due to the confirmation of fimbriae necrosis during surgery, preservation of uterine tube integrity, fallopian tube detorsion, excision of cyanotic fimbriae and hemorrhagic cyst of fimbriae, intra-abdominal fluid suction and fimbriae repair performed. The patient discharged in good condition after two days and gave birth to a healthy baby at 38 weeks of gestation by cesarean section. Conclusion: Isolated fallopian tube torsion should be considered as a potential differential diagnosis in patients that have acute lower abdominal pain in women of reproductive ages and even adolescents. Early diagnosis and early surgical intervention are critical to maintaining the fallopian tube and fertility in the future. Laparoscopy is one of the main diagnostic tools for assessing, management and maintenance isolated torsion of the fallopian tube.