Abstract
In a personal series, 45 patients with postanal pilonidal sinus were treated by the Karydakis operation. The sinus is excised using an eccentric elliptical incision, the medial edge of which is undermined and advanced across the midline to produce a lateral vertical scar and shallower natal cleft. Forty patients were followed up for an average of 33 mo. There were 2 wound hematomata, 4 wound infections and 2 recurrences, 1 of which was not in the scar. A low recurrence rate can be achieved by flattening the natal cleft and closing the skin away from the midline.

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