CT head bone window axial calvarium - labeling questions

Case contributed by Assoc Prof Craig Hacking

Normal CT head bone window (with labels)

Annotated image

The labeled structures are (excluding the correct side):

  1. frontal crest
  2. mastoid air cell
  3. squamous portion of the temporal bone
  4. groove for the sigmoid sinus
  5. squamomastoid suture
  6. internal occipital protuberance
  7. occipitomastoid suture
  8. pterion
  9. groove for the middle meningeal artery
  10. groove for the superior sagittal sinus
  11. squamosal suture
  12. lambdoid suture
  13. coronal suture
  14. squamous process of the frontal bone
  15. squamous process of the occipital bone
  16. lambdoid suture
  17. coronal suture
  18. bregma
  19. lambda
  20. sagittal suture
  21. parietal bone
  22. parietal foramen
  23. sagittal suture
  24. vertex

Normal CT head bone window (without labels)

CT

The same normal head CT bone window without labels for reference.

Case Discussion

The labeled structures are (excluding the correct side):

  1. frontal crest
  2. mastoid air cell
  3. squamous portion of the temporal bone
  4. groove for the sigmoid sinus
  5. squamomastoid suture
  6. internal occipital protuberance
  7. occipitomastoid suture
  8. pterion
  9. groove for the middle meningeal artery
  10. groove for the superior sagittal sinus
  11. squamosal suture
  12. lambdoid suture
  13. coronal suture
  14. squamous process of the frontal bone
  15. squamous process of the occipital bone
  16. lambdoid suture
  17. coronal suture
  18. bregma
  19. lambda
  20. sagittal suture
  21. parietal bone
  22. parietal foramen
  23. sagittal suture
  24. vertex

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