1.   An upper respiratory infection or nasal allergy can block drainage from a sinus cavity and permit a bacterial infection to take hold in the accumulating mucus.

2.   A forensic anthropologist pointed out the sinus cavities, explaining how they are unique to every human, and how these matched.

3.   But allergies also can cause asthma, an inflammation of the bronchial tubes, and sinusitis, an inflammation of the sinus cavities around the eyes and nose.

4.   Doctors say there is a risk that mucus could seep into his sinus cavity, swelling it and causing seizures, even blindness.

5.   Each sinus cavity is connected to the nasal passages by a very thin tube that allows mucus to drain and air exchange to take place.

6.   His nose was sliced open through the sinus cavity and hung grotesquely open.

7.   His nose was severed, leaving a gaping hole into his sinus cavity.

8.   Infected mucus that drips from sinus cavities into the lower respiratory tract can cause or aggravate bronchitis, chronic cough and asthma.

9.   Like colds, allergies can also trigger sinusitis, an inflammation of the sinus cavities around the eyes and nose.

10.   Previous studies have suggested that the large sinus cavities of Neanderthals served a similar function.