Carbon monoxide CO poisoning = MRI lesions involving globus pallidus and cerebral deep WM A)Symmetric high signal intensity lesions in bilateral globus pallidi B)MRI in same pt as in A reveals high signal lesions in bilateral substantia nigra (dotted arrow) in addition to bilateral pallidal lesions C)MRI obtained 2 months after exposure shows confluent high signal lesions in the bilateral periventricular deep white matter