Risk of confirmatory bias: Parafalcine meningioma mimicking acute subarachnoid haemorrhage

We present the case of a 44-year-old hypertensive lady with a history of headache and collapse whose initial CT demonstrated parafalcine hyperdensity. We attributed this to spontaneous subarachnoid haemorrhage, but subsequent imaging revealed an anterior parafalcine meningioma. Confirmatory bias may have played a role. The purpose of this report is to highlight and learn from this error in judgement while presenting an unusual clinical case of meningioma masquerading as haemorrhage