You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is A 35 year female comes with Size 5 cm tumour of the oral cavity + single lymph node of 2 cm diameter on the same side in the neck is staged as and explain in detail?
TNM staging of oral cancer :
Tx : Cannot be assessed e.g. already excised.
T0 : No evidence of primary tumor (occult primary).
Tis : Carcinoma in - situ.
T1 : Equal to or less than 2 cm in greatest dimension.
T2 : More than 2 cm. bul less than or equal to 4 cm.
T3 : More than 4 cm.
T4a : Moderately advanced local disease :
Lip and check - involvement of cortical bone, skin, inferior alveolar nerve.
Tongue - extrinsic muscles, skin.
T4b : Very advanced local disease :
Check - involvement of masticatory space, base of skull, internal carotid artery.
Internal carotid artery.
TNM staging of cavity tumors. Status of lymph nodes 'N' :