Abstract
Nasal cavity, paranasal cavity, pharynx and larynx are surrounded by many bones, which shadows disturbed X-ray diagnosis of head and neck.
Tomography of nasal and paranasal cavity is useful for the diagnosis of the tumor of nasal and paranasal cavtiy. And, tomography of naso-and mesopharynx is very important for the purpose of the diagnosis of those area. The lateral view of nasopharyngeal tomogram shows the condition of the nasopharyngeal walls and more valuable for the diagnosis of tumor.
Laryngogram shows conditions of the laryngeal walls creariy, and present many findings in respect to laryngeal diseases.
Regarding the X-ray examination of upper air passage, both tomography and laryngography are necessaly.
