抄録
Two cases of pleomorphic adenoma of the parotid gland combined with ipsilateral facial nerve paralysis were reported. Diabetes mellitus was considered to be responsible for the occurrence of facial palsy in case 1. In case 2, direct invasion of the tumor to the facial nerve was considered to have caused facial nerve paralysis. This second case might be a rare case of pleomorphic adenoma which gave rise to distant metastasis in the thyroid gland, as there was evidence of infiltrative growth. We believe this case was one form of a malignant mixed tumor similar to the histologically benign metastasizing mixed tumor as reported by Batsakis in 1982. Since persistent facial nerve paralysis associated with an ipsilateral parotid tumor is considered a definite criterion of malignancy, a restoration of facial nerve function is not usually attempted. However, from our experience in these two cases, we conclude that the facial nerve should be restored in every case of facial nerve paralysis associated with a parotid tumor.
