Surgical excision and omentalisation of mineralised paraprostatic cysts with concurrent ureteroneocystostomy and perineal herniorrhaphy in a 9‐year‐old male entire Bearded Collie

This case report describes the diagnosis, management and the short- and long-term outcomes of a dog with paraprostatic cysts and associated perineal herniation. A 9-year-old male entire Bearded Collie was referred for a caudal abdominal mass and right perineal hernia noted on routine examination. Computed Tomography (CT) imaging of the abdomen demonstrated a large bilobed fluid filled structure adjacent to the prostate, extending into the peritoneal cavity and the right perineal space, causing perineal herniation and partial obstruction of the right ureter. Surgical excision of the mass was performed and ureteroneocystostomy was required due to involvement of the right ureter. Excisional biopsy, omentalisation of the prostate and right-sided herniorrhaphy utilising an internal obturator muscle flap was performed. Histopathology confirmed the diagnosis of paraprostatic cyst with extensive osseous metaplasia and multifocal chronic-active interstitial prostatitis. The dog re-presented 16 months later with a left-sided perineal hernia and a left-sided herniorrhaphy was performed. Twenty-nine months after the initial surgery the dog presented with stranguria associated with recurrent bilateral perineal herniation and a retroflexed urinary bladder. Cystopexy and colopexy were performed. No sign of recurrence of the paraprostatic cysts was noted intraoperatively. This is the first reported case of surgical excision of paraprostatic cysts with concurrent ureteroneocystostomy. To the authors knowledge, this is also the longest reported case follow up (>4 years) of a dog following complete excision of paraprostatic cysts.