A misdiagnosed abdominal tumor due to rare cause

Due to 3-day dull pain in the right upper abdomen, a 41-year-old woman was admitted to the hospital. She had normal diet, bowel movement and no nausea or vomiting. Physical examination and laboratory tests were normal. Enhanced CT scan of the abdomen suggested a huge mass (10 cm diameter) at the pancreatic head that infringed the duodenum and hepatic colon flexure; intratumoral bleeding was noted (Panel A).