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Calculating nasoseptal flap dimensions: a cadaveric study using cone beam computed tomography.

Ellen Ten Dam1, Astrid G W Korsten-Meijer, Rutger H Schepers

  • 1Department of Otorhinolaryngology/Head and Neck Surgery, University Medical Center Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands, e.ten.dam@umcg.nl.

European Archives of Oto-Rhino-Laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : Affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery
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PubMed
Summary

Cone beam computed tomography (CBCT) accurately measures nasoseptal flap (NSF) dimensions, aiding in preoperative planning for skull base reconstruction. This technique helps customize flaps to improve patient outcomes in minimally invasive surgery.

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Area of Science:

  • Otorhinolaryngology
  • Neurosurgery
  • Medical Imaging

Background:

  • Nasoseptal flaps (NSFs) are crucial for skull base reconstruction.
  • Accurate measurement of NSF dimensions is essential for successful surgical planning.
  • Cone beam computed tomography (CBCT) offers advanced 3D imaging capabilities.

Purpose of the Study:

  • To evaluate the suitability of CBCT for calculating nasoseptal flap (NSF) dimensions.
  • To compare CBCT-derived NSF measurements with anatomical dissections.
  • To assess the reach and vascularity of the NSF using CBCT.

Main Methods:

  • Anatomical study involving 10 cadavers.
  • CBCT imaging to determine NSF length and surface area.
  • Comparison of CBCT measurements with direct anatomical dissections.
  • Perfusion of external carotid arteries with colored Iomeron to visualize vascularity.

Main Results:

  • Strong positive correlation (r > 0.70) between CBCT and anatomical dissection measurements.
  • CBCT NSF surface area averaged 19.8 cm²; lengths were approximately 78 mm.
  • NSF positioning anterior to the sphenoid sinus allows anterior skull base coverage.
  • NSF positioning along the skull base from the sella reached anterior ethmoidal sinuses.

Conclusions:

  • CBCT is a valuable tool for accurately calculating NSF dimensions.
  • CBCT is less suitable for demonstrating NSF vascularity in cadavers.
  • Preoperative planning with CBCT can enable customized NSF creation, potentially sparing septal mucosa.
  • Customized NSF planning may enhance patient outcomes in minimally invasive skull base surgery.