Mapping the frontal sinus ostia using virtual endoscopy

Area of Science:

• Anatomical studies
• Surgical planning
• Medical imaging

Background:

• The frontal sinus recess is a complex anatomical area crucial for sinus surgery.
• Understanding the precise location of the frontal sinus opening relative to surrounding cells is vital for effective surgical planning.
• Variability in frontal sinus anatomy can pose challenges during endoscopic sinus surgery.

Purpose of the Study:

• To determine the relative anatomical location of the frontal sinus opening to adjacent frontal cells using virtual endoscopy.
• To assess the predictability of the frontal sinus ostium's location based on surrounding anatomical variations.
• To evaluate the utility of virtual endoscopy in analyzing frontal recess anatomy for surgical planning.

Main Methods:

• Retrospective analysis of high-resolution computed tomography (HRCT) scans from 50 adult patients without prior sinus disease or surgery.
• Virtual endoscopy software was utilized to map 100 frontal recesses.
• Mapping focused on the presence and relative position of the frontal sinus ostium to specific cells: agger nasi cells (ANC), frontal bullar, frontal types 1, 2, and 3, supraorbital ethmoid, suprabullar, and intersinus septal cells.

Main Results:

• Agger nasi cells (ANC) and frontal type 3 cells were highly prevalent (92% and 45%, respectively).
• Analysis of ostial rows (anterior-posterior and medial-lateral) demonstrated predictable patterns for the frontal sinus opening's location.
• For instance, when three rows of cells were present medially to laterally, the frontal sinus opening was centrally located in 56% of cases.

Conclusions:

• The frontal sinus recess exhibits significant anatomical variability and complexity.
• Virtual endoscopy is a valuable tool for analyzing frontal recess anatomy and aiding in presurgical planning.
• Despite anatomical variations, the probable location of the frontal sinus ostium can be predicted, enhancing surgical precision.