Lateralised internal carotid artery

The lateralised internal carotid artery is an anatomic variation of the course of the petrous segment of the internal carotid artery (ICA). It can be visualized on CT by its more posterolateral entrance to the skull base and protrusion into the anterior mesotympanum.

It may result in pulsatile tinnitus.

  • in the axial plane, the genu of the vertical and horizontal segments of the petrous ICA is more lateral than the mid-portion of the basal turn of the cochlea
  • focal thinned or dehiscent carotid plate (lateral wall of the carotid canal)
  • the inferior tympanic canaliculus is not affected
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Article information

rID: 32072
Section: Anatomy
Synonyms or Alternate Spellings:
  • Lateralized internal carotid artery
  • Lateralisation of internal carotid artery
  • Lateralized petrous internal carotid artery
  • Lateralised internal carotid arteries

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