Arteriovenous Haemangioma in Two Dogs and a Cat

Schoeniger, S J and Tivers, M S and Baines, S J and Summers, B A (2008) Arteriovenous Haemangioma in Two Dogs and a Cat. JOURNAL OF COMPARATIVE PATHOLOGY, 139 (2-3). pp. 130-136.

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Abstract

Haemangiomas are benign vascular tumours and several types can be distinguished based on microscopical features. Capillary and cavernous haemangiomas are most commonly reported in man and domestic animals. Arteriovenous haemangiomas are rare variants in man and herein we describe this subtype in two dogs and one cat. One clog and the cat presented with a cutaneous vascular lesion, the other dog with a bleeding mass in the tongue. Surgically excised masses comprised non-encapsulated proliferations of variably sized arterial- and vascular-like veessels, accompanied by clusters of capillaries and immature vascular structures In the feline cutaneous tumour and the canine lingual neoplasm. All vasoformative elements had von Willebrand factor- positive endothelia enclosed by a smooth muscle actin-positive tunica media or by pericytes. The results of this study expand the range of differential diagnoses for vascular neoplasms in the clog and cat. (C) 2008 Elsevier Ltd. All rights reserved.