Is mastoid and maxillary sinus the same thing?

No, the mastoid and maxillary sinus are not the same thing.

- The mastoid sinus is an air-filled space located behind the ear in the temporal bone. It is connected to the middle ear and helps to drain mucus and other fluids from the ear.

- The maxillary sinus is also an air-filled space, located in the upper jawbone. It is the largest of the four paranasal sinuses and helps to warm and moisten the air that we breathe.