title: Blurred vision and headaches in a patient positive for HBsAg.
mesh_terms: D006261:Headache / Q000209:etiology*; D006514:Hepatitis B Surface Antigens / Q000032:analysis; D006801:Humans; D008297:Male; D008875:Middle Aged; D010488:Polyarteritis Nodosa / Q000175:diagnosis*; D014786:Vision Disorders / Q000209:etiology*
chemical_list: D006514:Hepatitis B Surface Antigens