Recurrent pleomorphic adenoma of the parotid gland

Surgery of recurrent pleomorphic adenoma presents an increased risk of facial nerve injury and a considerable re-recurrence rate. A series of 33 patients with first recurrence of pleomorphic adenoma of the parotid gland was analyzed. The data were derived from medical records as well as from interviews and clinical examinations of all living patients. Histologic material of the initial and recurrent tumor were reviewed. Multifocal recurrence and carcinoma in pleomorphic adenoma were observed in 73% and 9% of patients, respectively. The incidence of permanent partial facial nerve injury after surgery was 23% in patients with initial enucleation and 14% in those with initial superficial parotidectomy (including 1 patient with facial nerve resection and 1 patient with a partial facial paresis before recurrence surgery). A subsequent recurrence occurred in 6 patients, all with initial enucleation after a mean time interval of 9 years. The preservation of the facial nerve was possible in all but 1 patient treated for the first recurrence with a relatively low rate of permanent partial facial paresis because of the use of the operating microscope and facial nerve monitor. To evaluate the re-recurrence rate, a follow-up of at least 10 years is necessary.