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Despite the high prevalence of cannabis use in schizophrenia, few studies
have examined the potential relationship between cannabis exposure and
brain structural abnormalities in schizophrenia.
To investigate prefrontal grey and white matter regions in patients
experiencing a first episode of schizophrenia with an additional
diagnosis of cannabis use or dependence (n=20) compared
with similar patients with no cannabis use (n=31) and
healthy volunteers (n=56).
Volumes of the superior frontal gyrus, anterior cingulate gyrus and
orbital frontal lobe were outlined manually from contiguous magnetic
resonance images and automatically segmented into grey and white
Patients who used cannabis had less anterior cingulate grey matter
compared with both patients who did not use cannabis and healthy
A defect in the anterior cingulate is associated with a history of
cannabis use among patients experiencing a first episode of schizophrenia
and could have a role in poor decision-making and in choosing more risky
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