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 An elderly male presents with 4x5 cm lump in right neck. FNAC revealed it to be squamous cell carcinoma. No primary was found. A diagnosis of unknown primary was made. According to AJCC system of classification, the TNM staging of the tumor w ould be: and explain in detail?
Ref: Haas /, Hoffmann TK, Engers E Ganzer V. Diagnostic strategies in cen-ical carcinoma of an unknown primary (CUP). EurAnch Otorhinolaryngol 2002 Jul;259(6):325-33/NCCN guidelines 2014/AJCC 2010Explanation:CARC INOMA OF UNKNOWN PRIMARY (CUP) (TNM/AJCC 2010 STAGING)Stage Information for Metastatic Squamous Neck Cancer with Occult Primary.PRIMARY TUMORT0: Patients with unknown primary tumor.Tx: Patients whose tumor cannot be assessed or is not assessed.REGIONAL LYMPH NODESN0: No regional node metastasis.Nx: Regional nodes cannot be assessed.Nl: Single ipsilateral node, < 3 cm.N2a: Single ipsi lateral node. > 3 cm and <6 cmN2b: Multiple ipsilateral nodes. < 6 cm.N2c: Contralateral or bilateral nodes. < 6 cm.N3: Node > 6 cm.METASTASISM0: No distant metastasis.Ml: Distant metastasis.Mx: Unknown presence or absence of metastasis (could not be assessed).