CASE 75: MRI BRAIN

DIAGNOSIS

HETEROTOPIA - Nodular Subependymal along right occipital horn of lateral ventricle (heterotopic grey matter tissue seen on all sequences).

DISCUSSION

MRI is the modality of choice

Heterotopia is interuption of normal neuronal migration 

Normal neuronal migration starts from ventricles and moves towards the cortex, so any disruption can cause abnormal signal anywhere between the ventricle (subependymal - most common) to subcortical location.

Nodular heterotopia is usually subependymal (as seen here) or subcortical

Diffuse heterotopia is either band heterotopia or lissencephaly