A Case of Osseous Metaplasic Paraprostatic Cyst in a Boxer Dog

This report describes a paraprostatic cyst in a sexually intact 7 years old Boxer. The clinical history of the dog revealed dysuria, hematuria, constipation and lameness in the right hind leg. An abdominal mass were discovered on clinical examination of the dog. Transabdominal ultrasonographic examination showed an abdominal mass with a cavernous pattern and a hyperechoic wall. The mass was filled with anechoic fluid and was observed to be related to the prostate and adjacent to the urinary bladder. It was decided to remove the mass surgically. Microscopic evaluation of the cystic mass revealed necrotic debris in the lumen along with fibrin; the cyst wall was rich in fibrous tissue and contained bony structures. The prostatic cyst described in this study was identified as an osseous metaplastic paraprostatic cyst on the basis of the clinical, laboratory, ultrasonographic and microscopic findings.