Carcinoma Ex pleomorphic adenoma is
Carcinoma Ex pleomorphic Adenoma / Malignant mixed tumour

Malignant change of pleomorphic adenoma
Has rapid growth and painful
Leads to paraesthsia and facial weakness.
Malignant change of pleomorphic adenoma
Regrowth of pleomorphic adenoma after superficial parotidectomy due to inadquate removal
Painless condition
Slow and progressive growth of pleomorphic adenoma