A right lateral frontal deep white matter arteriovenous malformation, with the nidus measuring approximately 1.5 cm predominantly fed through arteries from the superior branch of the right MCA and perhaps M1 perforators is present; draining via an enlarged deep parenchymal vein into the right internal cerebral vein; prominent rights vein of Rosenthal and Galen.
Associating venous aneurysm/varix is noted, probably protruding into the right lateral ventricle with an impression for possible obstructive effects over the foramen Monro on the right side.
No other abnormalities identified.
Conclusions:
Arteriovenous malformation identified, most likely grade III as per Spetzler-Martin classification:
Nidus less than 2 cm.
Internal cerebral venous drainage.
Likely compromising an eloquent area.