Click on image to view larger version.
Figure 1. CT scans show (a) a thin walled cystic mass with homogeneous hypodense content anterior to the sacrum, compressing the urinary bladder and anteriorly displacing the rectum and vagina. A discrete amount of floating fat can be seen anteriorly (arrowhead). (b) At an inferior level, a contrast enhancing solid nodule is seen, apparently vegetating from the posterior wall, in close relation with the coccyx. There is no evidence of bone destruction. (c) The mass extends inferiorly into the left ischiorectal fossa.
