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Description: Video 1. The video clip illustrates the endoscopic transmastoid posterior petrosal approach (EPPAP) in a case of recurrent chondrosarcoma invading the left petrous regions after multiple transcranial surgeries and endoscopic transnasal surgery (see case 4 demonstrated in Fig. 3). Preoperative MRI revealed the tumor extensively involving the petrous bone, the cerebellopontine angle, and the posterior cranial fossa and simultaneously invading into the jugular foramen, hypoglossal canal, and paraph
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