It’s situated above the nasal cavity, which is lined by the nasal mucosa. This mucous membrane ... nasal discomfort, abnormal ...

The sinuses are lined with ciliated stratified columnar epithelium and are contiguous with the upper respiratory tract via the sinus ostia. Inflammation of the sinuses causes mucosal edema and ...

In the polypoid form of the disease, mucosal protrusions, or polyps, block the nasal and sinus cavities. The severe form of the disease is often associated with asthma or NSAID-exacerbated ...