Equine Neuroaxonal Dystrophy (eNAD) and Equine Degenerative Myeloencephalopathy (EDM) by Amy Young April 15, 2020 Equine neuroaxonal dystrophy (eNAD) and equine degenerative myeloencephalopathy (EDM) result from abnormalities of specific neurons in the brainstem and spinal cord.