According to the statistics of Ellen T. Chang and Hans-Olov Adami, from 1993-1997 in Hanoi, the incidence of pharyngeal cancer was 16 per 100,000 people, and from 1995-1998 in Ho Chi Minh City the incidence Archopharynx cancer is 6.5 per 100,000 people [2]. Nasopharyngeal carcinoma is one of the five most common cancers in our country (cancers of the lung, stomach, breast, uterus, oropharynx) [3]. Because of the deep anatomical characteristics of the skull as well as earlystage symptoms, which are often poor and easily confused with otolaryngology, nasopharyngeal carcinoma is often overlooked in the initial diagnosis. Therefore, nasopharyngeal carcinoma is usually diagnosed late when the disease has been stage III, IV [4].

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