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Morphology according to cranial computed tomography of first‐episode cycloid psychosis and its long‐term‐course: differences compared to schizophrenia

Cranial computed tomography (CCT) findings for 37 patients with cycloid psychosis and 19 patients with DSM‐III‐R schizophrenia were compared with findings for age‐ and sex‐matched controls. Schizophrenic patients showed enlarged ventricles compared both to controls and to patients suffering from cycloid psychosis. In patients with cycloid psychosis, neither at the first episode nor after many years (mean 16.6 years) of disease were significant differences found compared to control subjects. Over the course of the illness, patients with cycloid psychosis showed ventricular enlargement which was correlated with age but not with the duration of illness. The morphological differences provide further evidence for the proposed nosological distinction between cycloid psychosis and schizophrenia.