The pathological changes in the acute phase of sinusitis are mucosal vasodilation, congestion, edema, increased secretions, and retention. In the chronic phase, the mucosal fibrous tissue proliferation, or polyp-like changes, after the inflammation invades the submucosa, a few cases can lead to osteo-periosteal abscess, bone resorption, broken gray, most cases are osteo-periostitis reactive osteophytes, clinical manifestations are mainly nasal congestion, runny nose, headache and pressure pain of the infected sinuses, different sinusitis have certain characteristics; maxillary sinusitis mostly both sides at the same time, if seen unilateral lesions, need to pay attention In addition to odontogenic infections, frontal sinusitis has a unilateral onset, which may be related to the long, curved nasal ducts on that side. If multiple sinuses are infected on one side, attention should be paid to whether there is blockage in the sinus orifice area of the middle nasal tract on the sick side.
The CT scan of paranasal sinusitis shows thickening of the mucosa of the nasal cavity and sinuses, with annular or polypoid nodules in the larger sinus cavities, and uniformly increased density in the narrower sinus cavities, with CT values of soft tissue density and visible fluid planes.