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There is a fluid density collection in the left middle cranial fossa ( 3.5 x 4.7 cm ) with an imperceptible wall and thinning of the overlying bone in keeping with an arachnoid cyst. This could be confirmed on follow up MRI. It exerts mass effect on the left temporal lobe and left lateral ventricle.
No evidence of acute ischaemia. No intra or extra-axial haemorrhage is seen. No hydrocephalus.