Canine disseminated peritoneal angiomatosis with arterial differentiation in a 10‐month‐old Rhodesian Ridgeback

Abstract

A 10‐month‐old, male entire Rhodesian Ridgeback was presented with a 1‐week history of vomiting, small and large intestinal diarrhoea, hyporexia and weight loss. Physical examination revealed a palpable abdominal mass. Abdominal ultrasonography and contrast computed tomography demonstrated multiple cystic masses of varied size and wall thickness with no appreciable origin. An exploratory laparotomy revealed multiple mass lesions throughout the mesentery, located adjacent to blood vessels and varying in size from approximately 2 mm up to 13 cm in diameter. In histologic sections, the nodular structures resembled thick‐walled arteries. Immunohistochemistry confirmed positive cytoplasmic immunoreactivity for von Willebrand factor, CD31 and smooth muscle actin. This is, to the authors’ knowledge, the first case of disseminated peritoneal angiomatosis with arterial differentiation in the dog. The dog was euthanased due to the progressive nature of the mass lesions.

Progressive angiomatosis, resembling human skeletal–extraskeletal angiomatosis, arising in multiple digits in two dogs

“…The combination of bone and visceral lesions has not been reported in veterinary species. We did not evaluate our cases with abdominal imaging, but there are several reports of visceral angiomatosis in companion animals (Ide et al 2013, Bacon et al 2021. The aetiology of angiomatosis is not clear.…”