Petromastoid canal

Dr Francis Deng and Dr Ayush Goel et al.

The petromastoid (or subarcuatecanal is a channel in the petrous temporal bone that joins the mastoid antrum to the posterior cranial fossa. It contains the subarcuate artery and vein 1.

Classification

The canal has been categorized by its size 1:

  • type I - invisible
  • type II - less than 0.5 mm width
  • type III - 0.5-1 mm width
  • type IV - greater than 1 mm width

Radiographic features

CT

On petrous temporal bone fine slices, the petromastoid canal is seen as a thin canal between the anterior and posterior part of the superior semicircular canal. It can easily be mistaken for a fracture line.

Anatomy: Head and neck

Anatomy: Head and neck

Article information

rID: 25368
System: Head & Neck
Section: Anatomy
Synonyms or Alternate Spellings:
  • Subarcuate canal

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Cases and figures

  • Case 1
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