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Left OMU pattern of sinusitis and successful ESS. The left OMU is occluded (white oval in a) and there is subtotal opacification of the maxillary and ethmoid sinuses on this side. Following ESS which includes a left anterior ethmoidectomy (dotted white arrows in b) and uncinectomy, there has been marked improvement: the antrostomy is patent (white arrow in b) and the ethmoid and maxillary sinuses are now clear. ESS, endoscopic sinus surgery; OMU, ostiomeatal unit.
