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Related Experiment Videos

Anatomic position of the asterion

J D Day1, M Tschabitscher

  • 1Department of Neurosurgery, Lahey Hitchcock Medical Center, Burlington, Massachusetts, USA.

Neurosurgery
|January 27, 1998
PubMed
Summary
This summary is machine-generated.

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The asterion landmark, used for posterior fossa surgery, shows significant variability. Its position frequently overlies the transverse-sigmoid sinus complex, posing risks during procedures.

Area of Science:

  • Anatomy
  • Neurosurgery
  • Surgical Landmarks

Background:

  • The asterion is a cranial landmark formed by the junction of the lambdoid, parietomastoid, and occipitomastoid sutures.
  • It is utilized in lateral surgical approaches to the posterior cranial fossa.
  • Variability in asterion positioning raises concerns about its reliability as a surgical landmark.

Purpose of the Study:

  • To evaluate the reliability of the asterion as a surgical landmark for accessing the posterior fossa.
  • To determine the precise anatomical location of the asterion relative to underlying structures.

Main Methods:

  • One hundred dried human skulls were analyzed.
  • A 2-mm drill hole was created at the asterion on each side.
  • The internal position of the drill hole was recorded to map the asterion's location.

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Main Results:

  • The asterion was situated over the posterior fossa dura in 32% (right) and 25% (left) of skulls.
  • In a majority of cases, 61% (right) and 66% (left), the asterion was located directly over the transverse-sigmoid sinus complex.
  • A small percentage, 7% (right) and 9% (left), had the asterion positioned superior to the sinus complex.

Conclusions:

  • The asterion is an unreliable landmark for precisely locating the posterior fossa dura.
  • Its frequent proximity to the transverse-sigmoid sinus complex presents a risk of inadvertent intraoperative sinus injury.
  • Surgical planning should consider the variability of the asterion to mitigate potential complications.