Keystone Flap Reconstruction After Large Mohs Micrographic Surgery Defect of Basal Cell Carcinoma on the Upper Arm: A Case Report.

Large defects after Mohs micrographic surgery present a reconstructive challenge. The keystone design perforator island flap has proven to be simple and effective in the repair of large skin defects after cancer removal. We present a case of such a defect on the upper arm that was successfully reconstructed with the keystone flap.