Retrospective study on 761 canine skin tumors

Os arquivos de biópsias de cães realizadas no Laboratório de Patologia Veterinária da Universidade Federal de Santa Maria entre 1964 e 2003 foram revisados à procura de tumores cutâneos. Dos 703 registros encontrados, em 570 (81,0%) estava descrito que o cão apresentava apenas um tumor na pele e, em 133 (19,0%), que o cão apresentava mais de um tumor. Seiscentos e cinqüenta e quatro (93,1%) cães apresentavam apenas um tipo histológico de tumor e 41 (5,8%) apresentavam dois tumores histologicamente distintos. Em sete (1,0%) cães, havia três tumores diferentes e em um (0,1%) cão foram diagnosticados quatro tumores não relacionados, finalizando um total de 761 tumores. Dos 761 tumores cutâneos encontrados, 673 (88,4%) eram neoplásicos e 88 (11,6%) eram não-neoplásicos. Os 15 tumores mais prevalentes em ordem decrescente de freqüência foram: mastocitoma, carcinoma de células escamosas, adenoma perianal, lipoma, tricoblastoma, carcinoma perianal, papiloma, cistos foliculares, hemangioma, hemangiossarcoma, melanoma, adenoma sebáceo, histiocitoma, hiperplasia sebácea nodular e fibroma.The biopsy files in dogs from the Veterinary Pathology Laboratory of the Universidade Federal de Santa Maria, RS, Brazil, from 1964 to 2003, were reviewed for skin tumors. In the 703 files, 570 (81.0%) it was reported that the dog had only one skin tumor and in 133 (19.0%), more than one tumor was described in the skin. Six hundred and fifty four (93.1%) dogs had only one histologic type of tumor and 41 (5.8%) had two tumors of different histologic types. In seven (1.0%) dogs there were three tumors of different histologic types and in one (0.1%) four histologically unrelated tumors were diagnosed, performing 761 tumors. Out of the total of 761 skin tumors found, 673 (88.4%) were neoplastic and 88 (11.6%) were non-neoplastic. The 15 more frequently found tumors, in decreasing order of frequency, were: mast cell tumor, squamous cell carcinoma, perianal adenoma, lipoma, trichoblastoma, perianal carcinoma, papilloma, follicular cysts, hemangioma, hemangiosarcoma, melanoma, sebaceous adenoma, histiocytoma, nodular sebaceous hyperplasia and fibroma