Aspectos clínico-terapêuticos e histopatológicos de um hemangiopericitoma canino - descrição de caso clínico no Hospital Escolar Veterinário

Abstract

Hemangiopericytoma is a rare and highly vascularized neoplasm of mesenchymal origin, that affects the subcutaneous tissue and originates from pericytes, which are cells located around of blood vessels. Its etiology is still unknown, however, there is evidence that point to trisomy 2, and predisposing factors are the age and size of the animal. It occurs frequently in the locomotor limbs, in the elbow and knee regions. The purpose of the The present work is to report a case of hemangiopericytoma in a male mixed breed dog entire, 6 years attended at the Veterinary School Hospital (H.E.V). The guardian's complaint was appearance of a nodule in the right hind limb, with evolution of 6 months. In the exam macroscopically, the neoformation appeared attached to the tibiotarsal joint, with a consistency firm and irregular edges, measuring 6 cm, with no signs of pain and no lameness. The exam was carried out cytopathological examination of the lesion, using fine needle aspiration. A liquid was observed bloody making the diagnosis inconclusive. Tests were performed for diagnosis complementary, that is, the blood count and radiography and the results were inconclusive, not allowing a definitive diagnosis. The treatment was surgical and consisted of neoplastic excision and was referred to the Pathological Anatomy Section (SAP). To the exam histopathologically, layers of fusiform cells organized in the form were observed concentric surrounding a central vessel and between the neoplastic cells a stroma consisting of collagen fibers and a small number of grouped cells and some isolated. With the result and histopathological characteristics, the patient was diagnosed definitive canine hemangiopericytoma, belonging to the perivascular subtype. After the procedure surgical, a clinical follow-up was carried out that lasted 8 months, to detect possible relapses. During this period, no signs of relapse were observed.(TRADUÇÃO NOSSA)