Urinary obstruction secondary to an ossifying fibroma of the os penis in a dog

• Published in: The Journal of the American Animal Hospital Association Vol. 40; no. 2; p. 152
• Main Authors: Mirkovic, Tatjana K, Shmon, Cindy L, Allen, Andrew L
• Format: Journal Article
• Language: English
• Published: United States 01-03-2004
• Subjects: Animals; Diagnosis, Differential; Dog Diseases - diagnosis; Dog Diseases - surgery; Dogs; Fibroma, Ossifying - complications; Fibroma, Ossifying - diagnosis; Fibroma, Ossifying - surgery; Fibroma, Ossifying - veterinary; Male; Penile Neoplasms - complications; Penile Neoplasms - diagnosis; Penile Neoplasms - surgery; Penile Neoplasms - veterinary; Treatment Outcome; Urethral Obstruction - diagnosis; Urethral Obstruction - etiology; Urethral Obstruction - surgery; Urethral Obstruction - veterinary
• ISSN: 1547-3317
• DOI: 10.5326/0400152

A 13-year-old, 25-kg, castrated male border collie was referred for evaluation of pollakiuria, stranguria, and a decreased urine stream. A calcified periurethral mass near the caudal aspect of the os penis was identified on survey abdominal radiographs. A retrograde contrast urethrocystogram demonstrated that the mass was compressing the penile urethra. The mass was surgically resected. A histopathological diagnosis of an ossifying fibroma of the os penis was made. This report describes an atypical presentation of a rare tumor, an ossifying fibroma, that caused a urinary obstruction in a male dog. A review of the incidence, histopathological features, and behavior of ossifying fibromas is included.