Large left frontal cerebral arteriovenous malformation (AVM).

Differential diagnoses to consider for gyriform-like brain parenchymal calcification are Sturge Weber syndrome, healed cortical infarcts, CNS infection(congenital TORCHs) and post radiotherapy changes. The key for this case is to identify the "bag of worm" vessels, nidus as well as in contrasted study to identify large nidus of malformed vessels.

Catheter angiography is typically performed for proper classification prior to either radiological or surgical intervention.