Imaging features of Benign Perianal lesions

Abstract

Magnetic resonance imaging provides detailed visualisation, identification and extent assessment of many anal disorders. While many studies are performed in the evaluation of malignant processes such as anorectal carcinoma, the primary focus of this pictorial review is benign lesions, which involve the anal canal and perianal spaces. This pictorial review will illustrate the MRI appearances of a variety of benign conditions, which predominantly affect the anal canal, including abscess, fistulae, lipomas, developmental cysts and inflammatory conditions. MRI aids in the identification and characterisation of these abnormalities, of coexisting complications and differentiation from other perineal abnormalities. This pictorial review highlights the spectrum of non-malignant processes involving the perianal region.

Perianal Fistula: An Overview

“…가장 중요한 세 가지 순서열은 지방억제(fat-saturated) T2 강조영상(T2-weighted image; 이하 T2WI), 조영증강(contrast-enhanced) 지방억제 T1 강조영상(T1-weighted image; 이하 T1WI)/터보스핀에코(turbo spin echo; 이하 TSE) sequences와 T2WI TSE sequences 들이다. 조영증강 T1WI와 TSE T2WI가 항문관의 해부학적 구조를 가장 잘 보여준다( 1 10 19 ). 사용하는 MR 기법은 Table 1 에 정리하였다.…”