Primary B-cell immunoblastic lymphoma of pancreas.

Extranodal lymphoma may present as an abdominal mass without evidence of disease elsewhere. Predominant pancreatic involvement with lymphoma is rare. Presenting as a pancreatic mass, it may be difficult to differentiate if from carcinoma. Ultrasound-guided fine needle biopsy and immunocytochemistry are helpful in establishing a histological diagnosis. It is important to differentiate lymphoma from carcinoma, because lymphoma is treated differently and has a better prognosis.