Fig. 4.
44-year-old female with recurrent fistulas after two operations.
CT fistulography (A, C) and MR imaging (contrast-enhanced T1-weighted with fat suppression in B): reconstructed images clearly show complicated spatial information of two separate fistula tracts (short white arrows) with irregularly shaped abscess (* in C), which closes to mid-anal canal. Internal tiny ramifications (long white arrows in *) are not exactly confirmed at corresponding position on MR image. Fistula cavities are surrounded by inflammatory tissue (fistula wall, + in A, B). Irregular shape of abscess (* in B).