J Korean Radiol Soc.  1999 Apr;40(4):733-735. 10.3348/jkrs.1999.40.4.733.

Inflammatory Pseudotumor of the Anal Sphincter Complex: A Case Report

• Lee SH
• Jung SL
• Ahn MI
• Kim JY
• Park YH

• KMID: 2103302
• DOI: http://doi.org/10.3348/jkrs.1999.40.4.733

Abstract

We describe a case of inflammatory pseudotumor involving the anal sphincter complex, and its ultrasonographyand MR imaging features. Transperineal ultrasonography showed a well-marginated ovoid low echoic lesionintermingled with sparse echogenic foci within the right anal sphincter complex. The lesion was of intermediatesignal intensity on T1-weighted images and of heterogeneous hyperintensity on T2-weighted, compared tosurrounding muscle. After the infusion of gadolinium, the le-sion showed heterogeneous enhancement, with amultifocal non-enhanced center. T 2 - weighted endorectal MR images were more accurate in depicting the lesion andanal sphincter complex, and the patient underwent surgical resection. The final histo-logic diagnosis wasinflammatory myofibroblastic tumor.

Keyword

Anus, abnormalities; Anus, US; Magnetic resonance(MR), intracavitary coils

MeSH Terms

Anal Canal*
Diagnosis
Gadolinium
Granuloma, Plasma Cell*
Humans
Magnetic Resonance Imaging
Myofibroblasts
Ultrasonography
Gadolinium