Nasolacrimal duct injury is a well established complication of functional endoscopic sinus surgery. In 1992, Bolger reported an incidence of nasolacrimal duct injuries in endoscopic sinus surgery of up to 15 per cent, but there is no documentation in microscopic sinus surgery. Fluorescein instillation into the lacrimal system via the punctum was done to determine the incidence of nasolacrimal duct injuries in 16 patients who underwent 32 microscopic sinus procedures. Only one patient exhibited nasolacrimal duct injury intraoperatively on the left side (0.3%). He had complete healing of the nasolacrimal duct at 2 months and no postoperative epiphora developed.
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