Vein of Galen aneurysmal malformation, compressing the Sylvian aqueduct.
Convexity subarachnoid space narrowing.
No diffusion restriction. Signal loss within the malformed vein of Galen seen on DWI due to T2 blackout effect; there is a mixture of dark and bright pixels even on the corresponding ADC map.
Dural venous sinuses seem unremarkable.
No T2* blooming.