This paper from South Korea analyses the pathology arising from 20 malignant sublingual gland tumours. Adenoid cystic carcinoma followed by mucoepidermoid carcinomas were the most common. Tumour invasion into the lingual nerve was detected in 40% of cases, and into the submandibular duct in 28% of cases. Regional lymph node involvement will alter levels Ib and IIa,. They advocate that high-grade tumours or adenoid cystic carcinomas submandibular gland resection along with aforementioned lymph node levels. There is no mention to the consideration of whether bilateral neck dissection be considered.