Type 6B Choledochal Cyst Unveiled: A Rare Entity in Pediatric Surgery - A Case Report and Review.

Choledochal cyst(CDC) originating from the cystic duct (Type VI A) is uncommon. Dilatation of both the common bile duct (CBD) and cystic duct (Type VI B) is exceptionally rare in children, with only a handful of adult cases documented in medical literature to date. We report a case of a 1-year-old child who was diagnosed with a Type VI B CDC involving dilation of both the cystic and CBDs, confirmed by imaging and histopathology following cholecystectomy, cyst excision, and hepaticoduodenostomy. While recent medical literature has begun to explore Type VI CDCs, documented cases, particularly in pediatric patients, remain extremely scarce. This case report contributes to the emerging understanding of Type VI B CDCs, providing valuable insights into their clinical presentation, diagnostic approach, and surgical management outcomes.