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 Indian J Med Microbiol  
 

Figure 3 (a-e):Transsphincteric fi stula. Axial T1W image (a) shows infl ammation in the right ischiorectal fossa (long arrow) and thickening of the right external sphincter (short arrow). Sequential caudocranial axial fat-saturated T2W images (b-d) depict a hyperintense tract in the right ischiorectal fossa (arrow in b) and its penetration of the right external sphincter (arrow in (d). Coronal fat-saturated T2W image (e) also shows the internal rectal opening (arrow)

Figure 3 (a-e):Transsphincteric fi stula. Axial T1W image (a) shows infl ammation in the right ischiorectal fossa (long arrow) and thickening of the right external sphincter (short arrow). Sequential caudocranial axial fat-saturated T2W images (b-d) depict a hyperintense tract in the right ischiorectal fossa (arrow in b) and its penetration of the right external sphincter (arrow in (d). Coronal fat-saturated T2W image (e) also shows the internal rectal opening (arrow)