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Childhood-onset schizophrenia: brain MRI rescan after 2 years of clozapine maintenance treatment

OBJECTIVE: The effect of clozapine on striatal morphology was examined in adolescents with childhood-onset schizophrenia. METHOD: Eight adolescent patients with onset of psychosis before age 12 and eight matched comparison subjects had initial and 2-year follow-up brain magnetic resonance imaging scans. Basal ganglia and lateral ventricle volumes were measured. The patients were on a clozapine regimen during the 2-year interim. RESULTS: Caudate volume was larger in the patients at the initial scanning, decreased in the patients between scans, and did not differ significantly between the patients and the comparison subjects at the second scanning. CONCLUSIONS: Caudate enlargement in patients with childhood-onset schizophrenia who are taking typical neuroleptics appears to be secondary to medication exposure. Rescanning to examine basal ganglia morphology is indicated for these patients when they are taking an atypical neuroleptic

Childhood-onset schizophrenia: an NIMH study in progress

An ongoing study of the phenomenology, genetics, neuropsychology, physiology (eye tracking, autonomic responsivity), neuroimaging, biochemistry, and pharmacology of childhood-onset schizophrenia is described, and pilot data are presented for the first 22 subjects. Differentiation from autism spectrum disorders and other poorly defined, severe neurodevelopmental disorders is needed. Eye tracking and autonomic results are similar to patterns seen in later-onset schizophrenia and possibly more striking. Magnetic resonance imaging showed larger left frontal ventricular horn area for the schizophrenia subjects, larger left caudate, and lack of normal caudate asymmetry. Fluorodeoxyglucose positron emission tomography during an auditory continuous performance task revealed decreased right parietal/occipital glucose metabolic rate in the schizophrenia subjects, which may be secondary to poor attentional performance, and increased glucose metabolic rate in three left frontal regions, a left parietal region, and the right putamen. Clozapine has been effective and well tolerated in an open trial with 12 adolescents who responded poorly to typical neuroleptics; 16 subjects have been enrolled in a double-blind comparison of haloperidol and clozapine. Longitudinal study of this narrowly defined and possibly more homogeneous group of very early-onset schizophrenia subjects will be relevant to current neurodevelopmental theories addressing the role of puberty, progression of pathology, and continuity or discontinuity with later-onset schizophrenia

NCEO Core Staff

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Brain anatomic magnetic resonance imaging in childhood-onset schizophrenia

BACKGROUND: Early-onset schizophrenia (first psychotic symptoms by age 12 years) has been the subject of a small number of studies, and its biological continuity with later-onset disorder has not been established. In this study quantitative anatomic brain magnetic resonance images of children and adolescents with early-onset schizophrenia were compared with those of matched controls. Brain abnormalities in childhood-onset schizophrenia were examined in relation to those reported for later-onset schizophrenics. METHODS: Anatomic brain magnetic resonance imaging scans were obtained for 21 patients (mean +/- SD age, 14.6 +/- 2.1 years; range, 10 to 18 years) with childhood-onset schizophrenia (13 males, eight females) and 33 age-, sex-, height-, and weight-matched normal controls. Quantitative measurements were obtained for the cerebrum, anterior frontal region, lateral ventricles, thalamus, caudate, putamen, and globus pallidus. RESULTS: Total cerebral volume and midsagittal thalamic area were smaller in the patients (analysis of variance, P = .002, and analysis of covariance, P = .03, respectively); the caudate, putamen, and globus pallidus were larger in the patients (analysis of covariance, P = .05, P = .007, and P \u3c .001, respectively); and the lateral ventricles tended to be larger in the patients (analysis of covariance, P = .06). Globus pallidus enlargement correlated with neuroleptic exposure and with age of onset of psychosis. The magnitude of abnormalities compared with controls was similar to that reported in adult studies, although there was a trend toward relatively smaller cerebral volumes for the childhood-onset group compared with controls. CONCLUSION: Brain anatomic abnormalities in childhood-onset schizophrenia are similar to those reported for adult populations, indicating overall continuity between these rare childhood cases and the adult schizophrenia populations