Colonic duplication is usually asymptomatic; however, when it is symptomatic, patients with this anomaly may present with bleeding, constipation, or manifestations of obstruction, perforation, or malignancy. We report the case of a sixteen-month-old boy who presented with diffuse ascites, and had complete colonic duplication and bladder duplication. Duplication of the colon associated with bladder duplication is a rare entity with only a few cases reported in the medical literature. In addition, it is an extremely rare cause of ascites.

Keywords: colonic duplication, bladder duplication , ascites