Os Penis Fracture Resulting in Urethral Obstruction in a Dog: A Case Report

Abstract

Fracture of the os penis (FOP) is a rare and underreported condition in dogs that  can result in serious complications, including urethral obstruction. This report  documents the clinical presentation, diagnosis, and successful surgical management  of a 7-year-old male mongrel dog with urethral obstruction secondary to an os penis  fracture. The dog presented with pollakiuria, dysuria, penile swelling, abdominal  distension, and urinary dribbling. Clinical examination revealed a distended  bladder and pain on urination, and catheterization was unsuccessful. Radiographic  imaging (ventrodorsal and lateral views) confirmed a fracture of the os penis, while  ultrasonography revealed urinary bladder distension and urethral dilation proximal  to the fracture. Surgical correction involved scrotal urethrostomy and castration  under general anaesthesia. Pre-medication included glycopyrrolate, diazepam, and  butorphanol, followed by induction with propofol and maintenance with isoflurane.  The urethral mucosa was sutured to the skin using non-absorbable polyamide  3-0 sutures, and a urinary catheter was placed to maintain patency. Postoperative  recovery was uneventful, with restoration of normal urination and a reduction  in serum creatinine to 1.2 mg/dL. This case highlights the importance of prompt  diagnosis and surgical intervention in os penis fractures complicated by urethral  obstruction.