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"M" line: New anatomical landmark for the maxillary sinus natural ostium
Janaina Gonçalves da Silva Leite1, Joao Flavio Nogueira2, John Pallanch3
1Pós-graduaçāo em cirurgia, Universidade Federal do Ceará, Fortaleza, Brazil.
Objective:
Describe a reliable anatomical landmark that can be used to locate the maxillary sinus natural ostium (MSNO) during endoscopic surgery, even if the uncinate process is preserved.
Design:
Descriptive anatomical.
Setting:
An anatomical and radiological study was performed to evaluate the consistency of the landmark, denominated "M" line.
Subjects And Methods:
Dissections were performed in 57 cadaver heads (114 sides). In addition, 73 computerised tomography (CT) scans (146 sides) of patients with chronic inflammatory sinonasal disease were analysed using a three-dimensional (3D) reconstruction computer program.
Results:
The "M" line crossed the MSNO in 112 dissected sides (98.2%) and 140 sides at CT 3D reconstruction (95.9%).
Conclusion:
The "M" line is a reliable anatomical landmark for predicting MSNO location. As such, it could improve and facilitate endoscopic sinus surgery, using traditional, minimally invasive or uncinate preserving techniques.
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