- A dictionary of medical eponyms

Cyriax' syndrome or sign

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A syndrome characterised by sudden severe attacks of pain caused by pressure on intercostal nerves by malformations of the eight, ninth, and tenth ribs on either side. There are autonomic symptoms, and a sensation of a slipping movement of the ribs, which is frequently confused with angina pectoris and intra-abdominal disorders. Pain may be elicited by sneezing, deep inspiration, movement of arm. Slipping rib syndrome involving the twelfth rib is known as the twelfth rib syndrome.


  • E. F. Cyriax:
    On various conditions that may simulate the referred pains of visceral disease, and a consideration of these from the point of view of cause and effect.
    Practitioner, London, 1919, 102: 314-322.
  • R. Davies-Colley:
    Slipping rib. British Medical Journal, London, 1922, 1: 432.

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