J Korean Soc Radiol.  2010 May;62(5):471-475. 10.3348/jksr.2010.62.5.471.

Perianal Mucinous Adenocarcinoma with an Emphasis on the MR Imaging Features: A Case Report

• Choo HJ
• Lee SJ
• Lee JW
• Jang NS
• Yoon HJ
• Lee EJ

• KMID: 2002956
• DOI: http://doi.org/10.3348/jksr.2010.62.5.471

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.

MeSH Terms

Adenocarcinoma, Mucinous
Aged, 80 and over
Anal Canal
Humans
Magnetic Resonance Imaging
Male
Mucins
Perianal Glands
Mucins

Figure

• 

  Fig. 1 An 80-year-old man with a surgically proven perianal mucinous adenocarcinoma. A. An axial CT image after administration of contrast material shows the presence of a multilocular mass with multiple marginal calcifications. The mass is attached to the posterior aspect of the anus and extends to the skin. B. T1-weighted MR image shows a slightly high signal intensity comparing to that of muscle, with a different internal signal intensity for each locule (small *: relatively hyposignal intensity, large *: relatively hypersignal intensity). Curvilinear high signal intensities along the margin (arrows) of some locules, which are consistent with the marginal calcification on CT, are also identified. C, D. On the axial and sagittal T2 weighted MR images, the multilocular mass is shown as having a markedly high signal intensity and a focal invasion into the posterior aspect of the extrinsic anal sphincter is identified (arrows). E, F. Axial and sagittal fat-saturated gadolinium-enhanced T1 weighted MR images show septal and peripheral enhancement of the tumor. G. The multilocular cystic wall is lined by mucinous columnar cells. An overlying perianal squamous epithelial layer is seen (H & E staining, × 40). H. The glandular epithelial cells have hyperchromatic and atypical nuclei with nuclear stratification (H & E staining, × 400).

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