Fundic Gallbladder Diverticulum Lesion in a Child Suspected to Be Congenital: A Case Report and Scoping Review.

Gallbladder diverticulum is an exceptionally rare congenital anomaly in children, with only isolated cases reported in the literature. We describe a 10-year-old girl with epilepsy and constipation who presented twice within 15 days with diffuse abdominal pain. Physical examination revealed generalized abdominal tenderness, and laboratory tests were unremarkable. Abdominal ultrasonography showed mild hepatic steatosis and a small fundal gallbladder outpouching measuring approximately 7 mm × 9 mm, suggestive of a diverticulum. Computed tomography (CT) also suggested a small fundal gallbladder diverticulum-like lesion. Notably, the family reported that the patient's older sister had undergone cholecystectomy for gallstones, during which a gallbladder diverticulum-like lesion was identified; however, because the event had occurred approximately 15 years earlier, only the first abdominal ultrasound report was available for review, and no histopathological reports could be retrieved. The scoping review systematically mapped the available evidence and confirmed that published pediatric experience remains extremely limited. Only two previously published pediatric cases were identified. Given the absence of complications for our patient, conservative management with gastroenterology follow-up was adopted. This case highlights the rarity of congenital gallbladder diverticulum in childhood, the diagnostic challenge of distinguishing true diverticula from anatomical variants, and the importance of correlating imaging findings with the clinical presentation.