[Analysis of recurrence and treatment results of parotid gland non-malignant tumors with particular focus on pleomorphic adenoma].

UNLABELLED: The aim of the study was to assess the correlation between non-malignant parotid gland tumors recurrence and patient related parameters (age, gender, duration of complaints), type of tumor (histological pattern, the tumor diameter, primary localization in superficial or a deep lobe) and the treatment methods. The endpoint of the analysis was to come up with the presentation of the treatment methods applied to pleomorphic adenoma.

MATERIAL AND

METHODS

between 1997 and 2006, 675 patients with non-malignant tumors of parotid gland were treated in a single institution, the tertiary center for ENT at the University Department in Poznań. In the case of 249 patients--extracapsullar dissection was the adopted method of treatment, while in the case of the remaining 426 patients--lateral parotidectomy was performed.

RESULTS

recurrence of tumor was diagnosed in 24 cases: 16 patients were found to have tumor with pleomorphic adenoma, 5--with cystadenolymphoma, 1--with onkocytoma, 1--with lipoma and 2--with monomorphic adenoma. Recurrence most often occurred inter-related with the two most common types of tumors: pleomorhic adenoma in 5% of the cases (12 out of 237) and cystadenolymphoma in 2.9% of the cases (12 out of 414). This inter-relation is, however, of negligible statistical significance (p=0.175). Yet, the multifactor analysis confirmed, that in case of pleomorhic adenoma, the duration of complaints for more than 3 years (p=0.001) and any previous extracapsullar dissection procedure (p=0.016) applied at the removal of the tumor did exert statistically significant impact upon recurrence. Tumor removal via extracapsullar dissection turned out to pose almost a 4 time greater risk of recurrence as compared to the lateral parotidectomy method.