Pilonidal sinus in an amputee.

A pilonidal sinus developed in the superio-medial aspect of the thigh of an above-knee amputee. This is an unusual site for the condition to develop. We suggest that the same aetiological factors that were responsible for the "Jeep Bottom" of World War II were also responsible for this problem in the amputation stump of a Falklands campaign casualty.