Several studies have been performed on the bovine leukemia since bovine leukemia virus (BLV) had been detected in 1982 in Korea. We have conducted histopathological study on the bovine lymphoma caused by BLV because only limited results were reported on the pathological characterization of lymphoma. Lymphoma tissues were obtained from cattle necropsied and slaughtered during a designated period. Lymphoma was classified histopathologically according to the National Cancer Institute Working Formulation. Leukotic tissues consisted of fairly uniform sheets of closely packed medium to large lymphocytes without any architectural arrangement in all 30 cases.

The change of plasma prostaglandin E2 level, natural killer cell activity and tumor cell growth were assayed after transplantation of EL-4 leukemia cells in C57BL/6 mice. Plasma prostaglandin E2 level was increased in EL-4 bearing mice, but indomethacin treated mice group showed low level. The tumor-derived prostaglandin E2 inhibited the post-target binding cytolytic process of natural killer activity. Indomethacin inhibited the growth of prostaglandin secreting EL-4 solid tumor

Granulomatous Meningoencephalitis (GME) is an inflamatory, non suppurative disease of the Central Nervous System. This disease has been described since 1972 and a great variety of terms have been used to name (THOMAS; EGGER14, 1989). This paper describes a case o f a 3 years and 8 months old, female Dachshund, that was brought to the Veterinary Teaching Hospital at UNESP, Botucatu, São Paulo, Brazil, showing incoordenation during the last 10 days and head tilt. After careful examination, concluding to irreversibility of the process, the dog was euthanatised. Necropsy findings were necrosis of the white cerebral matter and in histopathologic examination of the CNS was diagnosticated GME. | A Meningoencefalite Granulomatosa (MEG) é um processo inflamatório não supurativo do Sistema Nervoso Central (SNC). A MEG tem sido descrita desde 1972, e uma grande variedade de termos já foi usada para designar tal doença (THOMAS; EGER¹⁴, 1989). Este trabalho tem o objetivo de relatar o caso de um cão, fêmea, da raça Dachshund, com 3 anos e 8 meses de idade, que foi encaminhado ao Hospital Veterinário da Faculdade de Medicina Veterinária e Zootecnia, UNESP, Botucatu, com quadro de incoordenação havia 10 dias, evoluindo para tremores e desvio lateral da cabeça. Após exame clínico e constatando-se a irreversibilidade do processo, o animal foi submetido à eutanásia. A necrópsia revelou extensa área de leucomalácia, e os estudos histopatológicos mostraram tratar se de MEG, doença de extrema controvérsia e rara ocorrência na literatura compulsada.