An unusual case of cerebral autosomal-dominant arteriopathy with subcortical infarcts and leukoencephalopathy with occipital lobe involvement.

Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is an autosomal dominant angiopathy caused by a mutation in the notch 3 gene on chromosome 19. Clinically, patients may be asymptomatic or can present with recurrent ischemic episodes and strokes leading to dementia, depression, pseudobulbar palsy, and hemi- or quadraplegia. Additional manifestations that have been described include migraine (mostly with aura), psychiatric disturbances, and epileptic seizures. Neuroimaging is essential to the diagnosis of CADASIL. On imaging CADASIL is characterized by symmetric involvement by confluent lesions located subcortically in the frontal and temporal lobes as well as in the insula, periventricularly, in the centrum semiovale, in the internal and external capsule, basal ganglia, and brain stem; with relative sparing of the fronto-orbital and the occipital subcortical regions. We describe a 49 year old male with CADASIL with absence of temporal lobe findings on MRI but predominant lesions within the periventricular white matter, occipital lobes with extension into the subcortical frontal lobes, corpus callosum and cerebellar white matter. Although CADASIL characteristically presents with anterior temporal lobe involvement, these findings may be absent and our case addresses the atypical imaging findings in CADASIL.