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The nasopharynx includes the back of the nasal passage from above the soft palate to the upper part of the throat (see Figure: A Look Inside the Nose and Throat).
Squamous cell carcinoma is the most common cancer of the nasopharynx. Nasopharyngeal cancer may occur in people of any age group. Although rare in North America, nasopharyngeal cancer is one of the most common cancers among people of Chinese, especially southern Chinese, and Southeast Asian ancestry. This cancer is also more common among Chinese people who immigrated to North America than among other Americans. It is less common among American-born Chinese than their immigrant parents or grandparents.
The Epstein-Barr virus, which causes infectious mononucleosis, plays a role in the development of nasopharyngeal cancer. There is also a hereditary predisposition. In addition, children and young adults who eat large amounts of salted fish and food preserved with nitrites are more likely to develop nasopharyngeal cancer.
Often, the first symptom is persistent blockage of the nose or eustachian tubes, which causes a sensation of fullness or pain in the ears and hearing loss, particularly in one ear. If a eustachian tube is blocked, fluid may accumulate in the middle ear. A person also may have ear pain, a swollen face, a discharge of pus and blood from the nose, swollen lymph nodes, and nosebleeds. Part of the face or an eye may become paralyzed. Often, the cancer spreads to lymph nodes in the neck.
A doctor first examines the nasopharynx with a special mirror or flexible viewing tube (endoscope). If a tumor is found, a doctor does a biopsy of the tumor, in which a sample of tissue is removed and examined under a microscope. Computed tomography (CT) of the base of the skull and magnetic resonance imaging (MRI) of the head, nasopharynx, and base of the skull are done to evaluate the extent of the cancer. A positron emission tomography (PET) scan also commonly is done to assess the extent of the cancer and the lymph nodes in the neck.
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