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MRI showing right frontal air-filled cavity. -. Diffusion-weighted MRI showing area of acute infarction. -. CT showing osteoma in paranasal sinus causing defect resulting in right pneumatocoele. An 84-year-old man in Ireland stunned doctors when scans revealed that he seemed to be missing a large chunk of his brain. Instead of brain tissue, the doctors found a 9cm (~3.5 inch) pressurized pocket of air where much of his right frontal lobe ought to be. The doctors reported the discovery recently in BMJ Case Reports . The empty head space was particularly surprising because the man arrived in the emergency department with afflictions otherwise common for his age. He had been complaining to his... Full story

13 March