Transoral robotic surgery of parapharyngeal space tumours: a series of four cases.

Tumours arising from the parapharyngeal space (PPS) represent less than 1% of all head and neck tumours. Salivary gland tumours account for 40-50% of PPS lesions and are located in the pre-styloid parapharyngeal space. Pleomorphic adenomas represent 80-90% of salivary tumours in the PPS. Recently, transoral robotic surgery (TORS) has become common in head and neck surgery as a minimally invasive procedure. Four cases of benign PPS tumour treated with TORS are presented here. Preoperative diagnosis was conducted by fine needle aspiration biopsy and magnetic resonance imaging, and the results were used to plan the correct surgical approach. One case required a change of approach to conventional transoral blunt dissection. Patients required pain control and reported dysphagia symptoms for a period of weeks, but no nasogastric tube was needed at any time. This case series indicates that TORS is a safe surgical procedure for the excision of benign tumours of the PPS in selected cases.