title: Malignant mesothelioma of the tunica vaginalis in a dog.
abstract: A 12-year-old Scottish terrier had a scrotal mass which was diagnosed as a malignant mesothelioma of the tunica vaginalis. The tumour resulted in a rapidly fatal clinical course with direct extension into the peritoneal cavity via the inguinal canal; there were no haematogenous or lymphatic metastases. This is the first case report of such a tumour in the dog. The histology and differential diagnoses of these tumours and a review of similar tumours in other species and possible causative agents are given.
mesh_terms: D000818:Animals; D004283:Dog Diseases / Q000473:pathology*; D004285:Dogs; D008297:Male; D008654:Mesothelioma / Q000473:pathology / Q000662:veterinary*; D013736:Testicular Neoplasms / Q000473:pathology / Q000662:veterinary*