what is thickening of the sinuses
Sinusitis is an inflammation, thickening, and swelling of the normal tissue called mucosa, which lines all the sinuses.This same type of tissue lines all the passages of your nose as well as the small channels which connect the nose and sinuses.These channels, or ostiomeatal complex, which is pictured above with the gray shading, can become blocked by swollen tissue.his same type of tissue lines all the passages of your nose as well as the small channels which connect the nose and sinuses. These channels, or ostiomeatal complex, which is pictured above with the gray shading, can become blocked by swollen tissue.