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Drop attacks

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

Drop attacks describes the sudden falling to one's knees without loss of consciousness and without warning. Recovery is immediate.

Possible cause of drop attacks include:

  • colloid cyst - this may cause a transient blockage of the cerebral aqueduct (like a ball-valve)
  • vertebro-basilar stroke
  • spondylotic osteophytes impinging on vertebral arteries with cranial rotation
  • idiopathic

Often the attacks spontaneously stop after a year or two.

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