The data from 20 dogs with histopathologically confirmed granulomatous meningoencephalomyelitis were reviewed in an attempt to identify clinical signs and morphological and cellular parameters, particularly the infiltration of mast cells, which might be associated with the clinical course of the disease. Thirteen of the dogs had the acute form of the disease and seven had the chronic form. Young to middle-aged, small breed female dogs were over-represented. Central vestibular signs were observed in six of the dogs with the acute disease. Analyses of cerebrospinal fluid revealed moderate to severe pleocytosis and high protein concentrations in all cases. Histopathological investigations revealed disseminated perivascular cuffs, large confluent granulomata, tissue necrosis, infiltration with neutrophils and a large number of mitotic cells in the dogs with either of the clinical forms of the disease. Tryptase-positive mast cells were observed in all the cases, but there were significantly larger numbers in the dogs with the acute form.
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