softening of the gray matter of the central nervous system.
focal symmetrical spinal poliomalacia
a disease of young sheep and of unknown etiology observed only in Kenya and characterized by focal softening of the gray matter of the spinal cord, especially the cervical cord, and paralysis especially of the forelimbs. Similar lesions and clinical signs are also observed in pigs, except that the paralysis is posterior. It is associated with selenium toxicosis.