Abdominal pain in pregnant individuals presents diagnostic challenges, especially when appendicitis is suspected. We report a rare case of a 26-year-old pregnant female with recurrent right lower quadrant (RLQ) abdominal pain initially misdiagnosed as a urinary tract infection. Diagnostic uncertainty led to a magnetic resonance imaging (MRI) scan, which revealed a right adnexal cystic structure and a thickened tubular structure adjacent to the cecal pole, raising concerns of complicated appendicitis. Subsequent diagnostic laparoscopy revealed a right-sided fallopian tube paratubal cyst with 360-degree torsion and associated fallopian tube torsion without the involvement of the ovary. The cyst was successfully excised, and the patient subsequently delivered a healthy baby via emergency lower section caesarean section.

Abdominal pain during pregnancy has various causes. Diagnosing appendicitis during pregnancy is challenging due to anatomical and physiological changes. Ultrasound (US) is commonly used but has limited accuracy. Computed tomography (CT) is avoided due to radiation risks, while MRI is increasingly used and shows high diagnostic accuracy or aids in alternative diagnoses. Regardless of the diagnosis, the prompt recognition of intraabdominal pathology is crucial to prevent fetal morbidity.

This case highlights the challenges in the accurate diagnosis of abdominal pain during pregnancy and emphasizes the importance of considering alternative pathologies to prevent delays in treatment and complications. Clinicians should consider diagnostic laparoscopy for pregnant patients with equivocal investigations and lower abdominal pain. The differential diagnosis may include both common and rare causes such as concomitant paratubal cyst and isolated fallopian tube torsion (IFTT), emphasizing a high index of suspicion and collaboration with obstetric colleagues to ensure optimal care.