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FIG 1. Axial T2-weighted images (5400/103 [TR/TE]). Multiple, confluent, hyperintense, cystlike lesions exist in the right thalamo-ponto-mesencephalic region, exerting mass effect and compressing the cerebral aqueduct and the upper half of the fourth ventricle. The arrow shows periventricular edema caused by the obstructive hydrocephalus.
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