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Primary Neoplasms of Peritoneal and Sub-peritoneal Origin: CT Findings¹

¹ From the Department of Radiology, University of Wisconsin Medical School, E3/311 Clinical Science Center, 600 Highland Ave, Madison, WI 53792 (P.J.P.); the Department of Radiology, Uniformed Services University of the Health Sciences, Bethesda, Md (P.J.P.); and the Mallinckrodt Institute of Radiology, Washington University School of Medicine, St Louis, Mo (S.B.). Presented as an education exhibit at the 2003 RSNA Annual Meeting. Received June 30, 2004; revision requested September 21 and received October 6; accepted October 7. P.J.P. is a medical consultant for Viatronix, Inc; S.B. has no financial relationships to disclose. Address correspondence to P.J.P. (e-mail: ppickhardt{at}mail.radiology.wisc.edu).

Peritoneal carcinomatosis is a common metastatic manifestation of many organ-based malignancies, particularly carcinomas of the gastrointestinal tract and ovaries. Primary neoplasms of peritoneal and sub-peritoneal origin occur much less frequently than metastatic peritoneal involvement from a known or occult primary tumor; however, these rare primary lesions (peritoneal mesothelioma, papillary serous carcinoma, desmoplastic small round cell tumor, benign and malignant mesenchymal tumors, lymphoproliferative disorders) are often first detected at computed tomography (CT) and should be considered in the absence of a known or suspected organ-based malignancy. A precise diagnosis based on imaging findings alone is often not possible. Furthermore, distinguishing a benign from a malignant process and a primary from a metastatic process is also challenging. Nevertheless, CT features combined with the patient’s relevant clinical and demographic data can help narrow the differential diagnosis for a peritoneum-based neoplasm in many cases. CT is useful not only for the detection, characterization, and staging of primary neoplasms of peritoneal and subperitoneal origin, but also for guiding biopsy for tissue diagnosis.

© RSNA, 2005

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