The usual causes of giant abdominal cystic masses in infants include mesenteric cysts, enteric duplication cysts, ovarian cysts, and cystic lymphangiomas, but choledochal cysts presenting in a gigantic form are rare.
Ultrasound is the primary diagnostic tool, typically revealing a well-defined cystic lesion, while MRI is used for further confirmation, particularly in complex cases involving associated anomalies.
The case study highlights a 4-month-old boy with a large Type 1 choledochal cyst, diagnosed via ultrasound and MRI, which was successfully treated through surgical cyst resection and a hepatico-jejunostomy procedure.