title: Childhood headaches caused by occult sinusitis.
authors.affiliation: Department of Otorhinolaryngology Leicester Royal Infirmary, UK.
authors.forename: C M
authors.initials: CM
authors.lastname: Knapp
authors.forename: A A
authors.initials: AA
authors.lastname: Narula
mesh_terms: D000293:Adolescent; D002648:Child; D002908:Chronic Disease; D006261:Headache / Q000209:etiology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D015523:Maxillary Sinusitis / Q000150:complications* / Q000175:diagnosis