Fig. 7
From: Preoperative MRI of perianal fistula evaluation and its impact on surgical outcome
A 17-year-old boy with perineal abscess seen at 6 o’clock of the anal canal opens through an inter-sphincteric sinus tract to the anus. a Axial T2-weighted image shows a perineal abscess (arrow) that exhibits high signal intensity. b Axial STIR-weighted image reveals high signal intensity of the perineal abscess (arrow). c Axial T1 fat-saturated weighted image reveals intermediate signal intensity of the perineal abscess (arrow). d Axial T1 fat-saturated post-contrast injection weighted image reveals contrast enhancement of the perineal abscess walls (arrow). e Axial diffusion-weighted image reveals high signal intensity of the perineal abscess walls (arrow). f Axial ADC mapping shows high signal intensity of the perineal abscess