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Hydrocephalus. Pineal region mass, coarse calcification of the tumour, mild enhancement.
Differential: A germ cell tumour (both germinoma and non-germinoma germ cell tumour, the latter particularly in view of coarse calcification) is favoured over a pineal parenchymal tumour (e.g. pineoctyoma or pineal parenchymal tumour with intermediate differentiation),