Homonymous Visual Field Defect Showing Negative MRI: Crossed Cerebellar Diaschisis

Homonymous hemianopia (HH) arises from a lesion interrupting the retrochiasmal visual pathways anywhere from the optic tract to the visual cortex. These lesions can usually be seen by structural imaging studies. Crossed cerebellar diaschisis (CCD) is a cerebellar suppression of the cerebral blood flow due to contralateral supratentorial lesions. CCD has usually been reported in patients with frontal or parietal lobe lesions, but rarely reported in the occipital visual cortex.