<prompt> 50 year tobacco chewer comes with chief complaints of a mass in the oral cavity of 1.5 cm with a single lymph node size 3 cm on ipsilateral neck. TNM stage is...T1 N3T3 N1T2 N2T1 N1  <response>: Ans. d T1 N1Ref: Bailey and Love Page 709Staging of Oral cavity Cancer: T1 - 2cm T2- 2-4cm T3 - 4-6cm T4 - adjacent structure involvement N1-Ipsilateral single node 3cm N2 a- Ipsilateral single node 3-6cm N2 b- Ipsilateral multiple nodes all 6cm N2 c- Contralateral nodes6cm N3- any node 6cm size M1-metastasis 