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Related Concept Videos

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Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
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The human heart is made up of three layers of tissue that are surrounded by the pericardium, a membrane that protects and confines the heart. The outermost layer, closest to the pericardium, is the epicardium. The pericardial cavity separates the pericardium from the epicardium. Beneath the epicardium is the myocardium, the middle layer, and the endocardium, the innermost layer. There are four chambers of the heart: the right atrium, the right ventricle, the left atrium, and the left ventricle.
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Related Experiment Video

Updated: Feb 2, 2026

Author Spotlight: Studying Clinical Characters and Epilepsy Outcomes After Frontal Disconnection in Patients with MOGHE
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The Bifurcated Frontal Sinus.

Edward D McCoul1,2,3, Kiranya E Tipirneni3,4

  • 1Department of Otorhinolaryngology, Ochsner Clinic Foundation, New Orleans, Louisiana, USA.

OTO Open
|November 28, 2018
PubMed
Summary
This summary is machine-generated.

A rare bifurcated frontal sinus variant, with two parallel cavities, was identified in 5.4% of patients undergoing endoscopic sinus surgery. Recognizing this anatomy is crucial for successful surgical outcomes and avoiding residual disease.

Keywords:
endoscopic sinus surgeryfrontal sinus anatomyimage guidancepneumatization

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Area of Science:

  • Otolaryngology
  • Surgical Anatomy
  • Rhinology

Background:

  • Frontal sinus anatomy presents complex variations affecting the frontal outflow tract.
  • Ethmoid pneumatization variations are well-documented.
  • A previously undescribed variant of parallel frontal sinus lumens sharing an outflow tract may impact surgical management.

Purpose of the Study:

  • To describe a novel anatomical variant: the bifurcated frontal sinus.
  • To report the prevalence and surgical implications of this variant.

Main Methods:

  • A case series was conducted at a tertiary rhinology practice.
  • Radiographic and intraoperative findings of 186 patients undergoing endoscopic sinus surgery were reviewed.
  • Ten patients with identified bifurcated frontal sinuses were analyzed for associated anatomical variations and surgical outcomes.

Main Results:

  • Computed tomography scans revealed frontal sinus bifurcation into medial and lateral lumens in 10 patients (5.4%).
  • All cases were treated with Draf 2a or 2b frontal sinusotomy, with no significant complications.
  • Associated frontal sinus cells, including agger nasi, supra-agger, suprabullar, and frontal septal cells, were frequently observed.

Conclusions:

  • The bifurcated frontal sinus is a significant anatomical variant requiring recognition for optimal surgical outcomes.
  • Failure to identify this variant can lead to incomplete sinus clearance and residual disease.
  • This variant can coexist with other frontal sinus cells and is safely managed with endoscopic techniques.