Sinusitis

The most common predisposing factor for acute bacterial sinusitis is a viral upper respiratory infection.

Contaminating bacteria cannot be cleared by mucociliary clearance due to mucosal inflammation from viral infection, leading to secondary bacterial infection

Evaluation with CT if complications such as orbital cellulitis or intracranial extension developed;

Findings - sinus opacification, mucosal thickening, and/or air fluid levels

Tx

1st line = Augmentin