Sneaky pancreatic head mass

A 60 yrs old male presented to the Father Muller Medical College and Hospital, India, with dyspeptic symptoms. On physical examination, epigastric tenderness was present and ultrasound revealed an ill defined in homogeneous hyper echoic lesion in the head of pancreas. Hemogram, serum amylase, serum lipase and liver function tests were all normal. Contrast-enhanced CT showed a homogeneous focal mass measuring about 5x6 cm in the pancreatic head, [Figs, la and b]. The mass was isodense with fat tissue, with interlobular septa, and without central or peripheral contrast. Upper GI endoscopy revealed mild antral gastritis. The patient improved with antacids