Tissue from a young chicken (X400; insert X100)
Description: Brain. Multifocal foci of neuronal degeneration with central chromatolysis of Nissl substance. Lymphocytic perivascular cuffing and microgliosis.
Insert: Multifocal microgliosis of Purkinje cell layer with flam like extensions into the molecular layer.
Morphologic Diagnosis: Multifocal, lymphocytic, enchephalomyelitis with neuronal degeneration (central chromatolysis) and microgliosis
Disease Diagnosis: Avian Enchephalomyelitis
Common lesions in other tissues: Dense lymphocytic aggregates in proventriculus muscularis (pathognomonic), ventriculus, pancreas, and myocardium. Dr Z. Raviv