Fig. 8
From: Ethnic variation in medial orbital wall anatomy and its implications for decompression surgery
Relative position of posterior ethmoid sinus to posterior maxillary wall. Using the slide where the posterior maxillary wall is at its most posterior position, a horizontal line is drawn (yellow). A vertical line (green) is then drawn and measured from this horizontal line to the most posterior aspect of ethmoidal sinus. A positive value was given if the posterior maxillary wall lay anterior to the posterior ethmoidal wall. A negative value was given if the posterior maxillary sinus wall lay posterior to the posterior ethmoidal wall