Abstract
An 80-year-old man, who presented with a perianal mass, showed a multilocular mass with peripheral calcification in the retroanal region at CT. The MR imaging detected a mass invading into the posterior aspect of the external anal sphincter, and was shown as having a high T1 and T2 signal intensity with a different T1 signal intensity in each locule. After contrast injection, septal and peripheral enhancement of the tumor was observed. Surgery was performed and revealed a perianal mucinous adenocarcinoma. To the best of our knowledge, this is the first report describing the MR features of a perianal mucinous adenocarcinoma in the Korean literature. We described a case of perianal mucinous adenocarcinoma with an emphasis on the MR imaging features.
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