59-year-old man has difficulty in breathing through his nose. On examination, his physician finds that he has swelling of mucous membranes of the superior nasal meatus. Which opening of the paranasal sinuses is most likely plugged?
Posterior ethmoidal sinus opens into the superior nasal meatus. Maxillary, frontal, and anterior and middle ethmoidal sinuses drain into middle nasal meatus.
Middle ethmoidal sinus
Maxillary sinus
Anterior ethmoidal sinus
Posterior ethmoidal sinus
Eye, Nose and Ear