56 years, Male, Reason: evaluate posterior anal margin related to lesion, lipoma? Please do fistula protocol. Pt is kidney transplant patient. History: 1 cm painless mass posterior anal margin. PELVIS: MalePROSTATE, SEMINAL VESICLES:The seminal vesicles are dilated bilaterally, likely representing seminal vesicle cysts. There is a small amount of T1 shortening within the right cyst, likely representing hemorrhagic/pernicious contents.BLADDER: No significant abnormality noted.LYMPH NODES: No significant abnormality noted.BOWEL, MESENTERY: No significant abnormality noted.BONES, SOFT TISSUES:A nonenhancing cystic lesion within the subcutaneous tissues immediately deep to the skin, posterior to the anal verge measures 2.2 x 1.0 cm (5/19). No fat is evident within the lesion. This lesion is unchanged from the recent CT of 1/23/2015 but was not present on the CT of 7/15/2011.OTHER: A right iliac fossa transplant is partially visualized.
1.Unilocular subcutaneous cyst posterior to the anal verge has nonspecific features. A developmental cyst, such as a tailgut cyst, or an epidermal inclusion cyst may be considered. An abscess is considered unlikely given lack of surrounding inflammatory changes. 2.Bilateral seminal vesical cysts.