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AIMS AND METHOD To assess the value of computed tomography (CT) in patients presenting to an old age psychiatry service over a 2-year period, and to evaluate a set of clinical prediction rules and the recommendations of the Royal College of Psychiatrists on the selection of patients for scanning. A retrospective review of the reports of 178 consecutive scans and case note reviews was carried out. RESULTS Four scan reports (2.3%) suggested potentially reversible causes (PRCs) of dementia. Of these, only two showed unequivocal organic brain lesions. Both of these patients were identified by each of the prediction rules tested. There was a high incidence of small vessel disease (32.8%) and infarcts (11.9%). CLINICAL IMPLICATIONS CT is a low-yield investigation in terms of identifying patients with PRCs of dementia. The tested clinical prediction rules appear sensitive in detection of PRCs. CT may demonstrate unsuspected cerebrovascular disease.

The value of cranial computed tomography in old age psychiatry: A review of the results of 178 consecutive scans