Primary Degenerative Dementia or DDD is described in The Diagnostic and Statistical Manual of Mental Disorders-III as dementia that has a subtle onset but gradually progresses. It has been left out of DSM-IV-TR because it is now recognized that dementia is based on symptom pattern and it is no longer implied that the condition is progressive in nature.

PRIMARY DEGENERATIVE DEMENTIA: "Ruth was diagnosed with presenile primary degenerative dementia in 1967."
Cite this page: N., Pam M.S., "PRIMARY DEGENERATIVE DEMENTIA," in, April 28, 2013, (accessed September 16, 2021).