Which of the following is true?

Bone, AMJ And Maxillary Sinus 24/10/2021

A. Maxillary sinus communicates with environment through middle meatus and nasal vestibule
B. Maxillary sinus is four- sided pyramid
C. In most of the cases, the main ostium is present in posterior third of hiatus semilunar
D. All of the above

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