Fig. 4
From: Diffusion-weighted imaging in the evaluation of perianal fistula and abscess
Extra-sphincteric perianal abscess grade 4. a DWI trace image showing an inter-sphincteric abscess (red arrow) that extends through the external sphincter at 2 o’clock to form a collection in the left anal fossa (yellow arrow). b ADC map revealing the markedly low ADC value of the abscess core (red arrow). c T2W and d post-contrast T1W-SPIR images confirming the same extent of the abscess