system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which of  the  following is the most common  tumour  to produce metastasis to cervical lymph nodes?
assistant
The correct answer is  Cervical nodal metastases may be the only manifestation of nasopharyngeal cancer.
Nodal metastases are seen in 75% of the patients, when first seen, about half of them with bilateral nodes.
Distant metastases involve bone, lung, liver and other sites.