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Nonepithelial Neoplasms of the Pancreas: Radiologic-Pathologic Correlation, Part 1--Benign Tumors: From the
Maria A Manning1, Amogh Srivastava1, Edina E Paal1
1From the American Institute for Radiologic Pathology, 1010 Wayne Ave, Suite 320, Silver Spring, MD 20910 (M.A.M.); Department of Radiology, MedStar Georgetown University Hospital, Washington, DC (M.A.M.); Department of Radiology, Beth Israel Deaconess Medical Center, Boston, Mass (A.S., K.J.M.); Pathology and Laboratory Medicine Service, VA Medical Center, Washington, DC (E.E.P.); Department of Pathology, George Washington University School of Medicine and Health Sciences, Washington, DC (E.E.P.); and Walter Reed National Military Medical Center, Bethesda, Md (C.F.G.).
Abstract:
Solid and cystic pancreatic neoplasms are being recognized more frequently with increasing utilization and spatial resolution of modern imaging techniques. In addition to the more common primary pancreatic solid (ductal adenocarcinoma) and cystic neoplasms of epithelial origin, nonepithelial neoplasms of the pancreas may appear as well-defined solid or cystic neoplasms. Most of these lesions have characteristic imaging features, such as a well-defined border, which allows differentiation from ductal adenocarcinoma. Solid masses include neurofibroma, ganglioneuroma, leiomyoma, lipoma, and perivascular epithelioid cell tumor (PEComa). Schwannomas and desmoid tumors can be solid or cystic. Cystic tumors include mature cystic teratoma and lymphangioma. Lipoma, PEComa, and mature cystic teratoma can contain fat, and ganglioneuroma and mature cystic teratoma may contain calcification. Although these unusual benign neoplasms are rare, the radiologist should at least consider them in the differential diagnosis of well-defined lesions of the pancreas. The goal of this comprehensive review is to improve understanding of these rare primary pancreatic mesenchymal tumors.