Optic-chiasmatic pilocytic astrocytoma
Known brain tumour. Now increasing facial weakness.
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Very large mixed density mass with peripheral calcification in the suprasellar cistern eroding the dorsum sellae, compressing the hypothalamus, midbrain and third ventricle, obstructing the foramina of Monro (drained on the right). Associated large middle cranial fossae arachnoid cysts.
Appearances are typical for this condition but there is a differential diagnosis of craniopharyngioma