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Guyon sign

Pronunciation: ge-yon[h]'


  1. ballottement of the kidney in cases of nephroptosis, especially when there is also a renal tumor;
  2. the hypoglossal nerve lies directly on the external carotid artery, whereby this vessel may be distinguished from the internal carotid when ligation is necessary.
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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.