<prompt> Which one of the following is the most common tumour to produce metastasis to cervical lymph nodes ?Glottic carcinomaNasopharyngeal carcinomaCarcinoma base of tongueCarcinoma lip  <response>: HOs triangle in supraclavicular fossa bounded by medial and lateral ends of clavicle and point where neck meets the shoulderis the site where metastatic nodes commonly exist in nasopharyngeal carcinoma.In 50 of cases nodal involvement is bilateral. Often cervical lymphadenopathy may be the first presentation SRB,5th,395. 