Lateralised internal carotid artery

The lateralised internal carotid artery is an anatomic variation of the course of the horizontal internal carotid artery (ICA). It can be visualised on CT by its more posterolateral entrance to the skull base and protrusion into the anterior mesotympanum. It may result in pulsatile tinnitus.

Radiographic features 

  • a lateralised ICA passes underneath the cochlea in the hypotympanum
  • focal thinned or dehiscent lateral wall of the carotid canal
  • the inferior tympanic canaliculus is not affected

Differential diagnosis 

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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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