Fig. 2
From: Anorectal anomalies in the male: revisiting the radiological classification
Distal colostogram in six different cases with recto-prostatic fistula. The asterisk (*) is marking for the first sacral vertebra (S1). The upper row (a, b, c) recto-prostatic fistula type 1: the distal rectum terminates at the level of S5 in a and at the level of S4 in b and c. Note the degree of sacral dysplasia in c: absent last piece and fusion between 2nd and 3rd pieces. The lower row (d, e, f) recto-prostatic fistula type 2: the distal rectum terminates at a higher level (S3). Note the missing last sacral piece in d and e compared to the complete sacrum in f. In cases with recto-prostatic fistula, it is common to find the distal rectum terminating at a higher level while communicating with the urethra at a lower level via a narrow fistulous tract (b, d, and e)