Temporoparietal Fascia Flap Endonasal Transposition in Skull Base Reconstruction: Surgical Technique.

Reconstruction of wide skull base defects resulting from multimodal treatment of cranial base malignancies are challenging. Endonasal pedicled flaps (e.g., Hadad-Bassagusteguy flap) are generally the first choice; however, inadequacy for the size and location of the defect or their unavailability are common occurrences in salvage reconstructions, and prior irradiation is an additional unfavorable condition for local flap viability. The temporoparietal fascia flap (TPFF) is a regional flap vascularized by the superficial temporal artery, which is able to survive and integrate even in postirradiated areas. Its properties, such as thinness, pliability, foldability, and the long pedicle, make it a versatile flap for reconstruction of various defects of the skull base, both in adults and children. In lateral skull surgery, TPFF proved to be effective in patients at higher risk of cerebrospinal fluid leak, whereas its transposition into the nasal cavity through a temporal-infratemporal tunnel has been widely reported to repair defects of the ventral skull base. It represents a safe and effective technique with minimal additional morbidity (potential alopecia or scalp necrosis). A recently described modification of this technique supports TPFF transposition via a supraorbital epidural corridor to reach the anterior skull base, especially for large defects with supraorbital extension. The present video (Video 1) shows the step-by-step TPFF harvesting and endonasal transposition via a temporal-infratemporal tunnel to repair a wide middle cranial fossa defect resulting from osteoradionecrosis after endoscopic resection and heavy-particle radiation therapy for sinonasal adenoid-cystic carcinoma. At 6-months follow-up, optimal healing without complications was observed.