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DOI:10.2214/AJR.05.0011
AJR 2006; 187:517-521
© American Roentgen Ray Society

Clinical Observations

Mucinous Adenocarcinoma Arising from Fistula in Ano: MRI Findings

Yukihiro Hama1, Kohzoh Makita2, Tetsuo Yamana3 and Keiichi Dodanuki4

1 Department of Radiology, National Defense Medical College, 3-2 Namiki, Tokorozawa, Saitama, 359-0042, Japan.
2 Department of Radiology, Tokyo-kita Social Insurance Hospital, Tokyo, Japan.
3 Coloproctology Center, Social Insurance Chuo General Hospital, Tokyo, Japan.
4 Department of Radiology, Social Insurance Chuo General Hospital, Tokyo, Japan.

OBJECTIVE. The purpose of this study was to describe MRI findings in 11 patients with mucinous adenocarcinomas arising from fistula in ano.

CONCLUSION. More than half of patients had a mass filled with markedly hyperintense content on T2-weighted fast spin-echo images, enhancing solid components within the mass, mesh-like internal enhancement, fluid collections without a thick fibrous capsule, contrast enhancement of peritumoral areas, and a fistula between the mass and the anus. Regional areas of lymph node enlargement were considered indirect findings of locally advanced mucinous adenocarcinoma. These MRI findings may help diagnose mucinous adenocarcinomas arising from fistula in ano.

Keywords: fistula in ano • gastrointestinal radiology • MRI • mucinous adenocarcinoma • oncologic imaging


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