Retroperitoneal masses: magnetic resonance imaging findings with pathologic correlation. 2007

Khaled M Elsayes, and Paul T Staveteig, and Vamsidhar R Narra, and Zong-Ming Chen, and Yahia L Moustafa, and Jeffrey Brown
Department of Radiology, University of Michigan Health Center, Ann Arbor, MI 48109-0030, USA. kelsayes@med.umich.edu

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.

UI MeSH Term Description Entries
D008067 Lipoma A benign tumor composed of fat cells (ADIPOCYTES). It can be surrounded by a thin layer of connective tissue (encapsulated), or diffuse without the capsule. Fatty Tumor,Hibernoma,Lipoma, Pleomorphic,Atypical Lipoma,Lipomata,Lipomatosis, Multiple,Atypical Lipomas,Fatty Tumors,Hibernomas,Lipoma, Atypical,Lipomas,Lipomas, Atypical,Lipomas, Pleomorphic,Lipomatas,Lipomatoses, Multiple,Multiple Lipomatoses,Multiple Lipomatosis,Pleomorphic Lipoma,Pleomorphic Lipomas,Tumor, Fatty,Tumors, Fatty
D008080 Liposarcoma A malignant tumor derived from primitive or embryonal lipoblastic cells. It may be composed of well-differentiated fat cells or may be dedifferentiated: myxoid (LIPOSARCOMA, MYXOID), round-celled, or pleomorphic, usually in association with a rich network of capillaries. Recurrences are common and dedifferentiated liposarcomas metastasize to the lungs or serosal surfaces. (From Dorland, 27th ed; Stedman, 25th ed) Liposarcoma, Dedifferentiated,Liposarcoma, Pleomorphic,Atypical Lipomatous Tumor,Liposarcoma, Well Differentiated,Well Differentiated Liposarcoma,Atypical Lipomatous Tumors,Dedifferentiated Liposarcoma,Dedifferentiated Liposarcomas,Lipomatous Tumor, Atypical,Liposarcomas,Pleomorphic Liposarcoma,Pleomorphic Liposarcomas,Well Differentiated Liposarcomas
D008202 Lymphangioma A benign tumor resulting from a congenital malformation of the lymphatic system. Lymphangioendothelioma is a type of lymphangioma in which endothelial cells are the dominant component. Lymphangioendothelioma,Lymphangioma, Cavernous,Endothelioma, Lymphatic,Cavernous Lymphangioma,Cavernous Lymphangiomas,Endotheliomas, Lymphatic,Lymphangioendotheliomas,Lymphangiomas,Lymphangiomas, Cavernous,Lymphatic Endothelioma,Lymphatic Endotheliomas
D008206 Lymphatic Diseases Diseases of LYMPH; LYMPH NODES; or LYMPHATIC VESSELS. Lymphatism,Status Lymphaticus,Disease, Lymphatic,Diseases, Lymphatic,Lymphatic Disease
D008207 Lymphatic Metastasis Transfer of a neoplasm from its primary site to lymph nodes or to distant parts of the body by way of the lymphatic system. Lymph Node Metastasis,Lymph Node Metastases,Lymphatic Metastases,Metastasis, Lymph Node
D008279 Magnetic Resonance Imaging Non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images. The concept includes proton spin tomographic techniques. Chemical Shift Imaging,MR Tomography,MRI Scans,MRI, Functional,Magnetic Resonance Image,Magnetic Resonance Imaging, Functional,Magnetization Transfer Contrast Imaging,NMR Imaging,NMR Tomography,Tomography, NMR,Tomography, Proton Spin,fMRI,Functional Magnetic Resonance Imaging,Imaging, Chemical Shift,Proton Spin Tomography,Spin Echo Imaging,Steady-State Free Precession MRI,Tomography, MR,Zeugmatography,Chemical Shift Imagings,Echo Imaging, Spin,Echo Imagings, Spin,Functional MRI,Functional MRIs,Image, Magnetic Resonance,Imaging, Magnetic Resonance,Imaging, NMR,Imaging, Spin Echo,Imagings, Chemical Shift,Imagings, Spin Echo,MRI Scan,MRIs, Functional,Magnetic Resonance Images,Resonance Image, Magnetic,Scan, MRI,Scans, MRI,Shift Imaging, Chemical,Shift Imagings, Chemical,Spin Echo Imagings,Steady State Free Precession MRI
D010235 Paraganglioma A neural crest tumor usually derived from the chromoreceptor tissue of a paraganglion, such as the carotid body, or medulla of the adrenal gland (usually called a chromaffinoma or pheochromocytoma). It is more common in women than in men. (Stedman, 25th ed; from Segen, Dictionary of Modern Medicine, 1992) Paraganglioma, Gangliocytic,Paragangliomata,Gangliocytic Paraganglioma,Gangliocytic Paragangliomas,Paragangliomas,Paragangliomatas
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D012185 Retroperitoneal Fibrosis A slowly progressive condition of unknown etiology, characterized by deposition of fibrous tissue in the retroperitoneal space compressing the ureters, great vessels, bile duct, and other structures. When associated with abdominal aortic aneurysm, it may be called chronic periaortitis or inflammatory perianeurysmal fibrosis. Ormond Disease,Perianeurysmal Fibrosis, Inflammatory,Periaortitis, Chronic,Fibrosis, Inflammatory Perianeurysmal,Fibrosis, Perianeurysmal Inflammatory,Idiopathic Retroperitoneal Fibrosis,Inflammatory Fibrosis, Perianeurysmal,Inflammatory Perianeurysmal Fibrosis,Ormond's Disease,Perianeurysmal Inflammatory Fibrosis,Chronic Periaortitides,Chronic Periaortitis,Disease, Ormond,Disease, Ormond's,Fibroses, Retroperitoneal,Fibrosis, Retroperitoneal,Periaortitides, Chronic,Retroperitoneal Fibroses
D012186 Retroperitoneal Neoplasms New abnormal growth of tissue in the RETROPERITONEAL SPACE. Neoplasm, Retroperitoneal,Neoplasms, Retroperitoneal,Retroperitoneal Neoplasm

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