Hematocolpos: An Unusual Cause of Right Iliac Fossa Pain

Acute appendicitis is the most frequent indication for emergency abdominal surgery in childhood. Despite being a common condition, the diagnosis of acute appendicitis can be challenging. Ultrasound examination remains the imaging tool of choice for the diagnosis of acute appendicitis. We report the case of a nine-year-old girl who presented with acute abdominal pain in the right lower quadrant accompanied by nausea and vomiting. Physical examination revealed right iliac fossa rebound tenderness. Ultrasound examination showed a dilated blind-ended structure in the right iliac fossa conferring the diagnosis of acute appendicitis. The patient underwent a CT scan which made the diagnosis of imperforate hymen with hematocolpos. The patient underwent hymenotomy and her symptoms showed complete resolution. Imperforate hymen with hematocolpos is a rare congenital genital tract anomaly. The case highlights the importance of appropriate genital examination in pediatric patients. In the present case, the patient might have undergone an unnecessary abdominal surgery if the correct diagnosis was not established.