Patients with chronic rhinosinusitis with frontal sinus affection indicated for sinuscopy will be randomly categorized in 2 groups: group A will have endoscopic directDraf IIa frontal sinusotomy and group B will have endoscopic angled Draf IIa frontal sinusotomy, the two groups will be compared according to ostium patency and perioperative morbidity
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Assess endoscopic direct access Draf IIa (carolyn's window approach) in creating patent frontal sinusotomy.
Timeframe: 2 years