Robotic lateral oropharyngectomy following diagnostic tonsillectomy is oncologically safe in patients with high risk human papillomavirus related squamous cell cancer.

PURPOSE Diagnostic tonsillectomy is rarely an oncologic operation owing to close or positive margins. The standard of care is for further treatment to the primary site, typically with adjuvant radiotherapy. METHODS 14 patients with close or positive margins following a diagnostic tonsillectomy underwent transoral robotic surgery (TORS) and lateral oropharyngectomy; five patients with the longest follow-up had their excision specimens examined with a step serial sectioning technique (SSS). RESULTS Conventional histopathological examination of the TORS resection specimens did not demonstrate residual carcinoma in 13 patients, confirmed by examination using SSS in 5 patients. There were no post-operative complications or long-term functional deficit. Seven patients received surgery alone with 100% overall and disease specific survival, respectively (median follow-up 27.5 months; range 5.2-50.4). CONCLUSIONS This prospective study suggests that TORS lateral oropharyngectomy alone is an oncologically safe treatment when close or positive margins are identified on diagnostic tonsillectomy in HPV-positive SCC