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Local hydrodynamic localization of a Chiari malformation. The complete or partial alteration of CSF flow via the foramen magnum results in the transmission of CSF pulsatility from the intracranial subarachnoid spaces (1) to elongated marrow and cerebellar tonsils (2). This pulsatility is subsequently transmitted to the subarachnoid CSF or the syringomyelic cavity (3).
