Surgical Pearl: Purse string suture in the management of poorly delineated melanomas

Abstract

The purse string suture technique has received little attention in the surgical literature. Its application in dermatologic surgery has been mainly to reduce the size of a surgical defect to allow placement of a smaller, full-thickness skin graft.1-4 We have found the purse string suture to be effective in the management of poorly demarcated melanoma. We have used the purse string technique in 10 patients with biopsy-confirmed melanoma. For most of them, the clinical margin of the neoplasm was poorly defined. All underwent excision of the clinically detectable lesion, using recommended guidelines of 5 mm for in situ melanoma, 1 cm for invasive melanoma with Breslow's depth less than 1 mm, and 2 cm for intermediate-thickness melanomas.5,6 The oval surgical defects were then managed with an intradermal circumferential purse string suture, with 3-0 or 4-0 nonabsorbable polypropylene.4 The purse string was tied, thereby either reducing the size of or in some cases completely closing the defect. The pathology reports were received in 48 to 72 hours. If a positive margin was present, the patient returned for additional surgery. The original oval defect was re-created after the removal of the purse string suture. This greatly facilitated a more precise measurement for additional margins and excision of the residual tumor. The newly created larger defect was often managed again with a purse string suture. If clear surgical margins were achieved, the purse string suture was removed after 21 days. The type of final reconstruction and its timing were primarily dependent on size and location of the lesion, as well as the degree of confidence in obtaining clear margins. We used fullthickness skin grafts, flaps, primary closure, and second-intention healing as final reconstructive options. No significant complications were observed. A biopsy-confirmed lentigo maligna on the right cheek (Fig. 1) with poorly definable clinical margins was outlined with the aid of a Wood's lamp and excised with a 5 mm margin. The oval From the Dermatology Service, Walter Reed Army Medical Center. The opinions and assertions contained herein are the private ones of the authors and are not to be construed as official or reflecting the views of the Department of Defense or the United States Army. Reprints not available from the authors. J Am Acad Dermatol 1998;38:99-101. 16/74/85559 Surgical Pearl: Purse string suture in the management of poorly delineated melanomas