Antero-medial maxillary sinus angle is an additional predictive factor for enhanced visibility during pre-lacrimal window approach.

Pathologies located at the posterior surface of the anterior wall and the floor (alveolar recess) of the maxillary sinus are challen- ging to visualize and access. Open approaches including lateral rhinotomy, Caldwell-Luc procedure or midfacial degloving allow a broad visualization but with a significant likelihood of post-operative morbidity (1). Access to the anterior wall and floor of the maxillary sinus by traditional endoscopic approaches is very difficult . The pre-lacrimal window approach (PLWA), as a modified endoscopic medial maxillectomy, provides a wide access to these challenging areas with a very low morbidity rate in total.