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Purpose Intracranial teratomas in children involving lateral structures such as the petrous portion of the temporal bone are very uncommon. The authors report a case of a petrous teratoma with significant extension into the cerebellopontine angle with brainstem compression. Case Report An 11-year-old girl presented left-sided facial weakness. Computed tomography (CT) demonstrated a multiloculated lesion expanding the labyrinthine structures in the left petrous temporal bone including the vestibule, semicircular canals, and cochlea, with extension to the left cerebellopontine angle via the expanded left internal auditory canal. The tumor was resected via a transtemporal approach with no evidence of recurrence at nearly 2 years. Conclusion Complete resection should be the primary treatment for these tumors to minimize the risk of recurrence. To the authors' knowledge, this is the first case report of a mature teratoma originating in the petrous bone with extension into the cerebellopontine angle.

Mature Teratoma of the Petrous Bone with Extension into the Cerebellopontine Angle: Case Report