Unusual tubular cystic lesion compressing inferior vena cava.

Fluid collections are important local complications of acute pancreatitis (AP). They are usually located in peri-pancreatic region but can also be found in various atypical locations like mediastinum, spleen, liver, pelvis or neck. Such pancreatic fluid collections in atypical locations can cause diagnostic dilemma and may cause delay in management. We report an interesting case of AP who presented to us with a walled-off necrosis mimicking a long cystic mass lesion surrounding the IVC.