Abstract
Choledochal cysts are rare congenital anomalies of the biliary tract characterized by dilation of the biliary tree. Most cases are diagnosed during the first decade of life, whereas only 20% are diagnosed in adulthood. They present as a classic trio: abdominal pain, jaundice, and a tangible mass. The mass is identified in just one-third of the cases. This case presents a patient with the trio, with a painful palpable mass of 15 cm in the epigastrium and right hypochondrium. Sonography and computed tomography were performed initially and suggested that this was a case of a hepatic cyst. However, magnetic resonance cholangiography was decisive in diagnosing this as a case of giant choledochal cyst (Todani I), which was confirmed by anatomopathology.