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Primary retroperitoneal masses: what is the differential diagnosis?

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Abstract

Primary retroperitoneal masses include a diverse, and often rare, group of neoplastic and non-neoplastic entities that arise within the retroperitoneum but do not originate from any retroperitoneal organ. Their overlapping appearances on cross-sectional imaging may pose a diagnostic challenge to the radiologist; familiarity with characteristic imaging features, together with relevant clinical information, helps to narrow the differential diagnosis. In this article, a systematic approach to identifying and classifying primary retroperitoneal masses is described. The normal anatomy of the retroperitoneum is reviewed with an emphasis on fascial planes, retroperitoneal compartments, and their contents using cross-sectional imaging. Specific radiologic signs to accurately identify an intra-abdominal mass as primary retroperitoneal are presented, first by confirming the location as retroperitoneal and secondly by excluding an organ of origin. A differential diagnosis based on a predominantly solid or cystic appearance, including neoplastic and non-neoplastic entities, is elaborated. Finally, key diagnostic clues based on characteristic imaging findings are described, which help to narrow the differential diagnosis. This article provides a comprehensive overview of the cross-sectional imaging features of primary retroperitoneal masses, including normal retroperitoneal anatomy, radiologic signs of retroperitoneal masses and the differential diagnosis of solid and cystic, neoplastic and non-neoplastic retroperitoneal masses, with a view to assist the radiologist in narrowing the differential diagnosis.

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Authors and Affiliations

  1. Department of Radiology, University of British Columbia, 3350 - 950 West 10th Avenue, Vancouver, BC, V5Z 4E3, Canada

    Elena P. Scali, Tracy M. Chandler, Joseph Coyle, Alison C. Harris & Silvia D. Chang

  2. Department of Radiology, St. Vincent’s University Hospital, Dublin, Ireland

    Eric J. Heffernan

Authors
  1. Elena P. Scali
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  2. Tracy M. Chandler
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  3. Eric J. Heffernan
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  4. Joseph Coyle
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  5. Alison C. Harris
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  6. Silvia D. Chang
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Correspondence to Elena P. Scali.

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Scali, E.P., Chandler, T.M., Heffernan, E.J. et al. Primary retroperitoneal masses: what is the differential diagnosis?. Abdom Imaging 40, 1887–1903 (2015). https://doi.org/10.1007/s00261-014-0311-x

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