The U-Turn Tournedos (UTT) Flap: A Technical Surgical Evolution for Deep Complex Calvarial Defects.

Patients treated for complex oncological calvarial defects are at a higher risk of severe complications (38%): infection, meningitis, dehiscence, and hardware/brain exposure. The patient cohorts at our center have led to the development of the "U-Turn" technical (UTT) addition of our previously reported turnover "tournedos" myocutaneous latissimus dorsi free flap. This allows for an improved ability to fill these large, round, complex defects, maintaining the safety of our original surgical technique, while improving aesthetic outcomes.A single-institution case series of complex microsurgical reconstructions for full-thickness oncologic calvarial defects using the UTT addition was reviewed. A free 30 cm latissimus dorsi myocutaneous flap was harvested, deepithelialized in-situ, and turned over with the dermal component laying on the avascular reconstructed dura. Both ends were positioned next to each other into a U shape and sutured together, creating a 15 cm round paddle.Fifty two complex microsurgical procedures for oncological calvarial defect reconstruction were performed. The 7 most recent were ideal for the UTT addition. There were no instances of microvascular thrombosis, infection, cerebral spinal fluid leak, or major wound healing problems. All procedures provided stable volume and full coverage, with all patients requiring debulking and contouring to achieve optimal aesthetic results. All flaps remained stable after debulking.The UTT addition takes the previously established "tournedos" latissimus dorsi free flap to another level of reconstruction, providing a larger volumetric filler, round shape, better defect filling, better durability, and better aesthetics, even in irradiated and/or infected calvarial chronic wound bed.