Abstract
Facial nerve palsy due to the benign parotid tumor is extremely rare. The authors experienced a case of pleomorphic adenoma in parotid gland, showing retrograde extension to mastoid bone along the facial nerve, resulting facial nerve palsy. An 82-year-old woman with facial nerve palsy for six years was revealed to have a solid mass in the close proximity to mastoid tip with contrast enhancement on computed tomography (CT). The mass extended into the air cells of temporal bone at the exiting site of the facial nerve through stylomastoid foramen. Based on the CT findings and her facial nerve palsy, initial diagnosis was facial nerve schwannoma. Mass was removed via transmastoid approach. The pathology was pleomorphic adenoma and direct nerve invasion was not observed.
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