Pancreatic lipomatous hamartoma mimicking other pancreatic tumor: a case report and literature review.

Pancreatic lipomatous hamartoma (PLH) is an extremely rare benign entity that forms a mass-like lesion. PLH lacks distinct features, and can be preoperatively misdiagnosed as a pancreatic tumor with lipomatous components, including pancreatic lipomatosis, lipoma, liposarcoma, and malignant tumors with fatty degeneration. Here, we report a case study of PLH in a 73-year-old male who presented with abdominal pain. Abdominal-enhanced computed tomography and magnetic resonance imaging revealed a 4.3×4-cm solid mass with a lipomatous component in the pancreatic head, and the mass displayed a centripetal pattern of contrast enhancement. The patient was preoperatively diagnosed with pancreatic liposarcoma, and subsequently underwent a pancreatoduodenectomy. The postoperative pathology and immunohistochemical analyses confirmed the diagnosis of PLH, which primarily contained mature adipocytes, small ducts, and a few well-preserved pancreatic acini. Although this disease is rare, we suggest that PLH should be considered during the differential diagnosis of pancreatic lesions with lipomatous components. Consideration of the potential for PLH disease might reduce the number of unnecessary resections.