Nasopharyngeal CT cannot exclude nasopharyngeal cancer. Nasopharyngeal cancer refers to malignant tumors occurring in the pharyngeal crypts of the lateral wall of nasopharynx, mostly squamous cell carcinoma, and the gold standard of clinical diagnosis is the biopsy pathological results. Typical nasopharyngeal cancer will have symptoms such as recurrent retractile bloody mucus, tinnitus, headache and nasal congestion, which are in fact manifested only when the tumor has developed to a certain size. In this case, if CT scan of nasopharynx is performed, it can find that there are occupying soft tissue lesions in nasopharynx, as well as the specific scope of the lesions, but still cannot diagnose whether it is nasopharyngeal cancer. Even in the early stage of nasopharyngeal cancer, the typical clinical symptoms are not yet fully manifested, and the CT scan of nasopharynx even has no abnormal findings at all. Therefore, the diagnosis of nasopharyngeal cancer is still confirmed by nasal endoscopy and local biopsy pathology.