Frontal Inus Ethmoidal sInuses sInus Removed anterolateral wall of sinus Frontal s Ethmoidal s Sphenoidal s axillary sFrontal sinus Ethmoidal sinuses Sphenoidal sinus Maxillary sinus Removed anterolateral wall of sinus Frontal s. Sphenoidal s. Ethmoidal s. Maxillary s