A Concept of "Boundary Determination" by the Combination of a Local Flap and Free Tissue Transfer Useful for the Prevention of Postoperative Complications After Complex and Widespread Skull Base Reconstruction.

The transplanted tissue is sutured to the stumps of the bones in skull base reconstruction. Concerning reconstruction by free tissue transfer, it is difficult that the tissue is accurately sutured/fixed to a complex three-dimensional structure. The authors devised a technique in which free tissue transfer is combined with a local flap. A pericranial flap is sutured/fixed onto the irregular border between the cranial and nasal cavities. A free tissue graft is transplanted cranial or caudal to the determined border. Clinical presentation 1 is a patient with carcinoma of the frontal sinus (T4bN0M0). Resection of the frontal bone/nasal bone/medial and superior walls of the orbit, frontal lobectomy was performed. Clinical presentation 2 is a patient with carcinoma of the maxillary sinus (T4aN0M0). Extended total maxillectomy, simultaneous resection of the facial skin/temporal muscle were performed. There were no serious postoperative complications related to compression or occlusion of the cerebral parenchyma or paranasal sinus.