Simultaneous occurrence of benign and malignant tumours in the ipsilateral parotid gland—retrospective study

The simultaneous occurrence of benign and malignant tumours in the ipsilateral parotid gland is extremely rare. The cases of five patients with synchronous multiple parotid gland tumours consisting of diverse combinations of benign and malignant histological types are presented here. In addition, all published cases of this entity identified in the PubMed, Embase, and Web of Science databases up to January 2018 were reviewed. It is concluded that clinical vigilance should be raised when multifocal tumours are indicated by imaging examinations, in the presence of unmovable, painful, and rapid growth or symptoms of facial nerve palsy.

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