Structural neuroimaging studies in chronic cannabis users.

Note: Yr. = Years; CU = Cannabis users; HC = Healthy controls; M = Male; F = Female; SD = Standard deviation; GM = Grey matter; GMd = Grey matter density; WM = White matter; WMd = White matter density; CSF = Cerebral spinal fluid; TIV = Total intracranial volume; FL = Frontal lobe; PL = Parietal lobe; TL = Temporal lobe; OL = Occipital lobe; BG = Basal ganglia; Cb = Cerebellum; L = Left hemisphere; R = Right hemisphere; T = Tesla; MRI = Magnetic resonance imaging; DTI = Diffusion tensor imaging; ROI = Region of interest; NE = Not specified; MD = Mean diffusivity; FA = Fractional anisotropy; PFC = Prefrontal cortex; BIS = Barrat Impulsivity scale.*If not otherwise specified, results are presented in terms of chronic cannabis users.• = Significant differences; ○ = Non-significant differences; = Not examined.**Two subjects in the marijuana group met criteria for excessive alcohol consumption.***Five subjects in the marijuana group met criteria for alcohol abuse.†Subjects with symptoms of alcohol abuse or dependence were included.†Multiple comparison correction.