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There is a large, well defined, T1 isointense mass lesion centred over the clivus, with small high signal foci, which my represent intratumoural haemorrhage. The lesion is T2 hyperintense and shows vivid, but heterogenous, enhancement on post-contrast images. It is invading the sphenoid sinus anteriorly, and the pontine cistern posteriorly, where it also abuts the basilar artery. It invades both cavernous sinuses, more pronounced on the left side with evidence of encasement of the left internal carotid artery (cavernous portion).