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Pathology · Neurodegeneration: frontotemporal dementia
Sample itemA 58-year-old man has had disinhibition, apathy and compulsive eating for 2 years with relative preservation of memory. MRI shows knife-edge atrophy of the frontal and anterior temporal lobes. Neuropathological examination would show which feature?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
C. Round silver-staining tau-positive intraneuronal inclusions
Pick disease, a form of frontotemporal lobar degeneration, shows circumscribed lobar atrophy with Pick bodies (round, tau-positive, argyrophilic inclusions) and ballooned Pick cells. Behaviour and language are impaired early, memory late.
Option by option
A. Spongiform change with prion protein
Spongiform change characterises Creutzfeldt-Jakob disease with rapid course and myoclonus.
B. Lewy bodies composed of alpha-synuclein
Lewy bodies characterise Parkinson disease and Lewy body dementia with visual hallucinations.
C. Round silver-staining tau-positive intraneuronal inclusions (correct)
Pick bodies are tau-positive round inclusions in frontotemporal degeneration.
D. Neuritic plaques with amyloid beta
Amyloid plaques with tangles characterise Alzheimer disease with early memory loss.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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