Definition of sinus: Best to ask your ENT. But in very general terms an opening into the maxillary sinus.
Answered 8/12/2015
2.4k views
A doctor has provided 1 answer
A doctor has provided 1 answer
3 doctors weighed in across 2 answers
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question