[A case of very late malignant degeneration of pleomorphic adenoma]

Incomplete excision of a pleomorphic adenoma exposes to a high risk of recurrence and tumor spread, making secondary surgery more difficult or a malignant transformation with a poor vital prognosis likely. Three histological types of pleomorphic adenomas can be observed when the tumor undergoes a transformation, namely the carcinoma ex-pleomorphic adenoma, the true malignant mixed tumor and the benign metastasizing mixed tumour.