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Khor WB et al. - The authors describe a 63-year-old woman with an intrasellar mass that presented with sudden headache and severe loss of vision. Magnetic resonance imaging was consistent with the clinical diagnosis of pituitary apoplexy, but trans-sphenoidal surgery and biopsy unexpectedly revealed an intrasellar meningioma, and excision could not be completed. A subsequent craniotomy was performed in order to remove the remainder of the tumour. Pre-operative differentiation of an intrasellar meningioma from a pituitary macroadenoma is important as it determines the method of surgical excision, but the two lesions may be indistinguishable even with modern neuro-imaging techniques.

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