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  • Acute sinusitis is an acute bacterial or viral infection of the paranasal sinuses.
  • Main causes: upper respiratory tract infection, trauma, oro-antral joint, dental infection, nasal defect and allergic mucosal edema.
  • Radiographic features: air-liquid level, air bubbles, mucosal thickening or complete opacification of the sinus.
  • Chronic sinusitis: The inflammation of the sinuses has been present for more than 3 months.
  • Main causes: persistent antral infection, persistent presence of a foreign body or an oro-antral connection.

Acute sinusitis, two different cases; Air-fluid level in the right sinus.

Pansinusitis: Inflammation of all paranasal sinuses on one or both sides. CBCT images show complete opacification of the frontal sinuses, ethmoid sinuses, maxillary sinuses and sphenoid sinuses.

Chronic sinusitis in the right antrum: Thickened mucosal lining and thickening of the antral wall. Presence of foreign body in the right antrum.

Mucosal thickening in the ethmoidal sinus; different cases.

Mucosal thickening in the sphenoid sinuses.

Mucosal thickening in the left frontal sinus, ethmoidal sinus and sphenoidal sinus.