- MULTIFOCAL TO COALESCING LYMPHOCYTIC PROVENTRICULITIS
- AVIAN PICORNAVIRUS
- Armed Forces Institute of Pathology
- One of the few gross lesions associated with avian encephalomyelitis (epidemic tremor) are dense lymphocytic nodules within the muscular layers of the proventriculus. Lymphocytic infiltrations are seen in the brain and in a few other visceral organs, to include the gizzard , but these proventricular nodules, especially when seen in young chicks with a history of neurologic signs or corneal opacity are considered characteristic, if not diagnostic, of the disease.