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CT head — collection between skull and dura
Computed tomography · Axial section, unenhanced · Head
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The shape of a collection inside the skull is dictated by anatomy, which is why this is a first-year topic and not just a neurosurgical one. The dura is firmly attached at the sutures. A collection outside the dura therefore cannot cross a suture, and is pushed into a biconvex lens. A collection deep to the dura can spread widely and follows the surface as a crescent. Learn the anatomy and the shapes follow.
Computed tomography · Axial section, unenhanced · © MedpulseIq.com
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CT head — collection between skull and dura — the whole bench in four lines. Read this on the way in.
- If you see this
- An axial computed tomogram of the head · A bright biconvex collection against the inner table · A collection that stops at a suture
- If asked to identify it
- There is a biconvex extra-axial collection against the inner table that does not cross a suture.
- If asked one more
- The dura is attached at the sutures, which is what makes the shape lens-like.
- If asked why it matters
- The pterion is the thinnest part of the vault and overlies the middle meningeal artery.
Then stop. Let the examiner ask the next question.