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Progressive Loss of Cerebellar Volume in Childhood-Onset Schizophrenia

OBJECTIVE: Childhood-onset schizophrenia is a severe and unremitting form of the disorder. Prospective brain magnetic resonance imaging (MRI) studies have found progressive loss of total cerebral volume during adolescence, primarily attributable to accelerated loss of cortical gray matter. Because there is evidence of cerebellar involvement in schizophrenia, the authors examined cerebellar volume and its relation to cortical gray matter development during adolescence in patients with childhood-onset schizophrenia and healthy comparison subjects. METHOD: Total cerebellar volume was algorithmically calculated for 108 anatomical brain MRI scans from 50 patients (20 of whom were female) and 101 scans from 50 age- and gender-matched healthy volunteers (20 of whom were female). The age range of the patients and comparison subjects was 8 to 24. Midsagittal vermal area and posterior-inferior vermal lobe volume were measured by hand. Prospective rescans were obtained at approximately 2-year intervals. Cross-sectional and longitudinal data were combined in mixed model regressions to compare developmental changes for the groups. RESULTS: In contrast to healthy volunteers, patients with schizophrenia showed a progressive loss of cerebellar volume during adolescence. Cerebellar and cerebral volume decreases were significantly correlated in childhood-onset schizophrenia. CONCLUSIONS: Childhood-onset schizophrenia is associated with significant progressive loss of cerebellar volume during adolescence, consistent with previously reported decreases in total cerebral and cortical gray matter. At least in these patients with severe early-onset schizophrenia, the loss appears secondary to a generalized process.

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