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Grossly, lymphocytic infiltration of the muscular region of the ventriculus has also been noted as well as perivascular infiltration within the brain and chord, with the exception of the cerebellum, where lesions can be found only in the nucleus cerebellaris. Pathognomonic lesions can be found within the midbrain and rotundua and ovidalis nucleus (microglisosis) and proventriculus (dense nodules within the muscular wall). Lesions can also be present in the pancreas.
Grossly, lymphocytic infiltration of the muscular region of the ventriculus has also been noted as well as perivascular infiltration within the brain and chord, with the exception of the cerebellum, where lesions can be found only in the nucleus cerebellaris. Pathognomonic lesions can be found within the midbrain and rotundua and ovidalis nucleus (microglisosis) and proventriculus (dense nodules within the muscular wall). Lesions can also be present in the pancreas.
'''Differential diagnosis''': include [[Newcastle Disease Virus| Newcastle disease (ND)]], [[Equine Viral Encephalitis| Equine encephalomyelitis infection]], nutritional disturbances ([[Rickets| rickets]], encephalomalacia, riboflavin deficiency), and [[Mareks Disease| Marek’s disease]] <ref name="Calnek, 2003"Calnek, B.W.(2003). Avian Encephalomyelitis. In: Saif, Y.M., Barnes, H.J., Glisson, J.R., Fadly, A.M., McDougald, L.R., Swayne, D.E., eds. Diseases of Poultry. Ames, Iowa, USA: Iowa State Press, 271-282.</ref>
'''Differential diagnosis''': include [[Newcastle Disease Virus| Newcastle disease (ND)]], [[Equine Viral Encephalitis| Equine encephalomyelitis infection]], nutritional disturbances ([[Rickets| rickets]], encephalomalacia, riboflavin deficiency), and [[Mareks Disease| Marek’s disease]] <ref name="Calnek, 2003">Calnek, B.W.(2003). '''Avian Encephalomyelitis'''. In: Saif, Y.M., Barnes, H.J., Glisson, J.R., Fadly, A.M., McDougald, L.R., Swayne, D.E., eds. ''Diseases of Poultry''. Ames, Iowa, USA: Iowa State Press, 271-282.</ref>
==Distribution==
==Distribution==