Internal Medicine
Online ISSN : 1349-7235
Print ISSN : 0918-2918
ISSN-L : 0918-2918

This article has now been updated. Please use the final version.

A Case of Primary Retroperitoneal Mucinous Cystadenocarcinoma during Long-term Administration of Infliximab for the Treatment of Crohn's Disease
Yoshiki MorihisaShunji UraiHiroyoshi IwagamiMasayuki ShimoyamaShinya OginoTomoko TerashitaHiroki MorimuraTakuji AkamatsuYoshito UenoyamaYukitaka Yamashita
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JOURNAL OPEN ACCESS Advance online publication

Article ID: 1593-23

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Abstract

We herein report a rare case of primary retroperitoneal mucinous cystadenocarcinoma (PRMC) in a 60-year-old man. The patient, who had been treated with infliximab for Crohn's disease of the colon for 13 years, was referred to our hospital for lower back pain. Contrast-enhanced computed tomography (CT) and magnetic resonance imaging revealed multiple cystic lesions in the right retroperitoneum, the calcification of the cyst, and bone lesions. Bone and CT-assisted biopsies of the retroperitoneal lesions revealed poorly differentiated adenocarcinoma. The patient was diagnosed with PRMC with bone metastases using immunohistochemical staining and positron emission tomography/CT.

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© 2023 by The Japanese Society of Internal Medicine
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