English word pseudodementia comes from English dementia, English pseudo- (False, not genuine, fake.)

Detailed word origin of pseudodementia

Dictionary entry	Language	Definition
dementia	English (eng)	(pathology) A progressive decline in cognitive function due to damage or disease in the brain beyond what might be expected from normal aging. Areas particularly affected include memory, attention, judgement, language and problem solving.. Madness or insanity.
pseudo-	English (eng)	False, not genuine, fake.
pseudodementia	English (eng)	(medicine) A mild form of dementia from which the patient (often an elderly woman) may recover.

Words with the same origin as pseudodementia