Alzheimer disease (CT only)
Long standing dementia - nursing home. Now fall.
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Marked volume loss is seen involving both hippocampi and parahippocampal gyri, especially anteriorly, with relative sparing of the rest of the temporal lobe.
No intracranial haemorrhage. Periventricular and deep white matter hypodensity in keeping with moderate small vessel ischaemia. No evidence of acute infarction. Ventricles are enlarged but are unchanged in size compared to the previous CT with a maximum biventricular distance of 4.6cm. No calvarial fracture or suspicious bony abnormality seen. Imaged paranasal sinuses and mastoid air cells are clear.
Features are consistent with the clinical impression of Alzheimer disease.
The degree of atrophy in advanced dementia can be striking. The preferential involvement of the hippocampi and parahippocampal gyri, with relative sparing of the rest of the temporal lobe is fairly typical of Alzheimer disease.