title: A young man with a headache.
authors.affiliation: St Mary's Hospital, London, UK. emredfern@hotmail.com
authors.forename: E
authors.initials: E
authors.lastname: Redfern
authors.forename: O
authors.initials: O
authors.lastname: Warren
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D013354:Empyema, Subdural / Q000150:complications* / Q000000981:diagnostic imaging / Q000628:therapy; D020773:Headache Disorders / Q000000981:diagnostic imaging / Q000209:etiology*; D006801:Humans; D008297:Male; D015523:Maxillary Sinusitis / Q000150:complications*; D014057:Tomography, X-Ray Computed