Lessons Learned from Surgical Management of the Largest Burned Patient Covered with Skin Isograft from His Monozygotic Twin Brother

<b>Background:</b> Early excision and autologous split-thickness skin grafting are the cornerstone of surgical management in severe burn injuries. In patients with extremely extensive deep burns, the lack of available donor sites represents a major life-threatening limitation. In the exceptional situation of monozygotic twins, skin isografting offers a unique solution by providing immunologically compatible skin without the risk of rejection. <b>Case report:</b> We report the case of a 33-year-old man who sustained flame burns involving 95% of his total body surface area, resulting in an extremely poor initial prognosis (ABSI 14, UBS 245). After early resuscitation and staged surgical excisions, the absence of sufficient autologous donor sites precluded definitive coverage using conventional techniques. On day 3, the existence of a monozygotic twin brother was identified. HLA genotyping confirmed complete identity, and skin donation was authorized by an independent ethics committee. <b>Methods:</b> Definitive wound coverage was achieved using staged split-thickness skin isografts harvested from the donor twin. Ultra-thin grafts (<0.2 mm) were obtained in three procedures (days 7, 11, and 45), primarily from the scalp, thighs, and back, and applied following sequential excisions. <b>Results:</b> All grafts survived without immunological rejection. Donor-site morbidity was minimal, with rapid healing and only mild residual hypopigmentation. The patient was discharged to rehabilitation on day 145. At 5-year follow-up, wounds were fully healed, functional outcome was satisfactory, and quality of life was good, with return to work and full independence. <b>Conclusions:</b> Skin isografting from a monozygotic twin is a rare but effective salvage strategy for patients with massive deep burns when autologous donor sites are insufficient, provided that ethical, legal, and donor safety considerations are rigorously addressed.