Figure 5From: Radiological findings in patients undergoing revision endoscopic sinus surgery: a retrospective case series study Residual frontal recess cells. A coronal C.T scan of a patient admitted for revision FESS showing a residual right agger nasi cell (arrow) pneumatising within right frontal recess and a residual left type III frontal cell (arrow head) pneumatising from the left frontal recess into the frontal sinus and partly obstructing the frontal sinus ostium.Back to article page