• In February 1994, 28 months after the second operation, she developed progressive dysphagia, dysarthria, and unsteady gait, followed within a few weeks by dementia. (cdc.gov)
  • Especially in the case of leukoencephalopathy developing due to substance use or environmental toxins, symptoms typically do not develop until several days to months after exposure to the pharmacological agent. (wikipedia.org)