title: Retroperitoneal masses: magnetic resonance imaging findings with pathologic correlation.
abstract: Primary retroperitoneal masses are a rare but diverse group of benign and malignant processes. Magnetic resonance (MR) imaging is playing an increasing role in evaluating retroperitoneal soft-tissue masses. Since the MR imaging features of most retroperitoneal soft-tissue masses are nonspecific, prediction of a specific histologic diagnosis remains a challenge for the radiologist. However, there are certain specific MR imaging appearances that are helpful. Dynamic enhancement patterns can reflect the vascularity of masses, differentiating benign from malignant soft-tissue masses. This article pictorially illustrates the MR imaging features of various common and uncommon retroperitoneal masses.
authors.affiliation: Department of Radiology, University of Michigan Health Center, Ann Arbor, MI 48109-0030, USA. kelsayes@med.umich.edu
authors.forename: Khaled M
authors.initials: KM
authors.lastname: Elsayes
authors.forename: Paul T
authors.initials: PT
authors.lastname: Staveteig
authors.forename: Vamsidhar R
authors.initials: VR
authors.lastname: Narra
authors.forename: Zong-Ming
authors.initials: ZM
authors.lastname: Chen
authors.forename: Yahia L
authors.initials: YL
authors.lastname: Moustafa
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Brown
mesh_terms: D018219:Histiocytoma, Benign Fibrous / Q000175:diagnosis; D006801:Humans; D008067:Lipoma / Q000175:diagnosis; D008080:Liposarcoma / Q000175:diagnosis; D008202:Lymphangioma / Q000175:diagnosis / Q000473:pathology; D008206:Lymphatic Diseases / Q000175:diagnosis; D008207:Lymphatic Metastasis; D008279:Magnetic Resonance Imaging; D018317:Nerve Sheath Neoplasms / Q000175:diagnosis; D010235:Paraganglioma / Q000175:diagnosis; D012185:Retroperitoneal Fibrosis / Q000175:diagnosis*; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis* / Q000473:pathology*