- Gray screentones: areas of neck irradiation. Frames: areas of nodal dissection
- Abbreviations: ACC adenoid cystic carcinoma, ENE extranodal extension, CXPA carcinoma ex pleomorphic adenoma, F site of failure, LVI lymphovascular invasion, M surgical margins, N pathologically involved nodal region, PNI perineurial invasion, pT pathological T stage, RP retropharyngeal nodal failure, SCC squamous cell carcinoma, SDC salivary duct carcinoma
- †, no elective neck dissection in cN0 patients; Perineural tumor recurrence at *hypoglossal nerve (Additional file 1: Figure S1B) and #facial and lingual nerves (Additional file 1: Figure S1A).