[Idiopathic eosinophilic meningoencephalomyelitis in a young Belgian Tervueren-shepherd dog].

Eosinophilic meningoencephalitis is a rare neurological disorder, affecting mainly young, male and medium-sized to large breed dogs. This case report describes the clinical signs of a grave and peracute clinical course and pathomorphological findings of a young, female Belgian Tervueren shepherd dog with eosinophilic meningoencephalomyelitis. The dog was presented to emergency service with acute onset of progressive apathy, developing into stupor and lateral recumbency. Despite immediate symptomatic treatment deteriorating consciousness with tetraparesis was noted and finally the dog went into coma associated with decerebrate rigidity. The dog was humanly euthanized on request of the owner 7 hours after presentation in the clinic. Gross pathological examination revealed circumscribed lesions particularly in the white matter of the cerebral cortex. Histologically, a multifocal severe, eosinophilic and granulomatous to necrotizing and lymphohistiocytic meningoencephalomyelitis was observed. In both adrenal glands, a severe eosinophilic and granulomatous inflammation was detected in the medulla. The etiopathogenesis remained undefined and the encephalitis was categorized as "meningoencephalomyelitis of unknown origin" (MUO).