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Cranial Bones: Lateral View01:27

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The human skull is composed of several bones that come together to protect the brain and support the structures of the face. The junctions where these bones meet are called sutures.
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Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
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Endoscopic Endonasal Trans-sphenoidal Approach: Minimally Invasive Surgery for Pituitary Adenomas
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Ossification around intercavernous sinus: An osteological finding that can complicate trans - sphenoidal surgery.

R K Narayan1, A Asghar1, S K Ghosh1

  • 1Department of Anatomy, All India Institute of Medical Sciences, Patna, 801507 Bihar, India.

Morphologie : Bulletin De L'Association Des Anatomistes
|July 11, 2020
PubMed
Summary

A unique anatomical variation, an osseous bar near the sella turcica, was identified. This finding may complicate neurosurgical procedures like transsphenoidal surgery.

Keywords:
Carotico – clinoid foramenInferior intercavernous sinusSella turcicaSella turcica bridgeTranssphenoidal surgery

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Area of Science:

  • Anatomy
  • Neurosurgery
  • Radiology

Background:

  • The sella turcica region is critical for neurosurgical interventions.
  • Anatomical variations in this area can pose significant surgical challenges.
  • Documenting rare anatomical findings is crucial for surgical planning and safety.

Purpose of the Study:

  • To document a unique anatomical variation of an osseous bar near the sella turcica.
  • To describe the morphology and dimensions of this variation.
  • To assess its potential implications for neurosurgical procedures.

Main Methods:

  • Examination of a human skull specimen.
  • Identification and description of a low-lying osseous bar connecting the right middle clinoid process to the dorsum sella.
  • Measurement of the sella turcica bridge (STB), carotico-clinoid foramen (CCF), interclinoid foramen (ICF), and the osseous bar/foramen using ImageJ software.

Main Results:

  • A unilateral, low-lying osseous bar forming a foramen near the inferior intercavernous sinus was observed.
  • Measurements of STB, CCF, and ICF showed bilateral asymmetry.
  • The osseous bar and its associated foramen were unilateral, precluding direct bilateral comparison.

Conclusions:

  • The identified osseous bar represents a rare anatomical variation.
  • The presence of this foramen near the inferior intercavernous sinus may increase hemorrhage risk during transsphenoidal surgery (TSS) or extended TSS (eTSS).
  • Awareness of such variations is vital for neurosurgeons to prevent intraoperative complications.