Laugh-induced headache,Cough headache, Secondary headache, Arnold-Chiari malformation, Hind brain anomaly
Sagittal T2W (A), and T1W (B) show downward displacement of the cerebellar tonsil at the posterior foramen magnum. There is high signal T2W of cavitary syrinx in cervical cord demonstrated in (A). The basilar invagination is also demonstrated as protruded dens with the tip at 11 mm. above the Chamberlain line (B).
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