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Thin-walled cystic lesion within a right part of the midbrain without perifocal oedema causing aqueductal compression and triventricular hydrocephalus (Vt up to 14mm), no transependymal imbibition.
Convexital arachnoid spaces narrowing.
Multiple multiform T2 hyperintense foci at the periventricular white matter.
No diffusion restriction.
Cystic signal characteristics on ADC maps due to T2 shine through effect.