Abstract
A seven-year-old spayed female Labrador retriever presented for necropsy following an acute history of thrombocytopenia, anemia, leukocytosis and abdominal effusion. A 2 × 3 × 10 cm, cylindrical to tubular, mottled red-to-tan mass extended from the caudal pelvic cavity caudally and ventrally under the dermis along the caudal aspect of the left pelvic limb adjacent to the semimembranosus and semitendinosus musculature. Histologic examination of the mass revealed a singular central lumen lined by urothelium that multifocally transitioned into non-keratinizing, stratified squamous epithelium associated with few hair follicles and sweat glands. The lumen was surrounded by a dense collagenous stroma containing numerous, variably sized blood vessels. The combination of lesions was consistent with a diagnosis of incomplete urethral duplication associated with a dermoid cyst and vascular hamartoma. To the authors’ knowledge, this is the first report of an incomplete urethral duplication associated with a dermoid cyst within a vascular hamartoma.
Highlights
Urethral duplication is a rare congenital anomaly infrequently diagnosed in domestic animal species
A total of five cases of urethral duplication have been reported in veterinary medicine, with four cases reported in dogs [1,2,3,4]
A case report of a dermoid cyst within the scrotum, abutting the urethra and traversing through the corpus cavernosum has been described in a juvenile, male human [5]
Summary
Urethral duplication is a rare congenital anomaly infrequently diagnosed in domestic animal species. A total of five cases of urethral duplication have been reported in veterinary medicine, with four cases reported in dogs [1,2,3,4]. Urethral duplication is frequently reported in conjunction with one or more urogenital anomalies. A singular case report of urethral duplication associated with a dermoid cyst was described in a dog as a diverticulum lined by urothelium, which transitioned rapidly to stratified squamous epithelium associated with hair follicles [3]. To the authors’ knowledge, this report describes the first case of urethral duplication associated with a dermoid cyst within a vascular hamartoma in any species
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