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Types of initial operation
*Enucleation and excision are no longer performed at our institute. The majority of cases that underwent initial enucleation were referred by another institute after recurrence.
PA: pleomorphic adenoma; RPA: recurrent pleomorphic adenoma; MT: malignant transformation; RPA-MT group: group of patients in whom recurrent pleomorphic adenoma remained benign; RPA+MT group: group of recurrent pleomorphic adenoma patients who later developed MT.
