Headache as the first and only sign of basilar impression.
D000368:Aged; D001269:Atlanto-Occipital Joint / Q000002:abnormalities*; D000013:Congenital Abnormalities; D006261:Headache / Q000209:etiology*; D006801:Humans; D010808:Physical Examination; D010985:Platybasia
ABNORMALITIES; ATLANTO-OCCIPITAL JOINT/abnormalities; HEADACHE/etiology and pathogenesis