title: Sinus headache: a clinical dilemma.
authors: E C
authors: EC
authors: Cashman
authors: P
authors: P
authors: Burns
authors: D
authors: D
authors: Smyth
mesh_terms: D003937:Diagnosis, Differential; D006261:Headache / Q000175:diagnosis* / Q000209:etiology*; D006801:Humans; D008881:Migraine Disorders / Q000175:diagnosis; D012852:Sinusitis / Q000150:complications* / Q000175:diagnosis*