“…Lateral soft-tissue X-ray of the neck has been found useful when diagnosis was in doubt (Jones, 1975;Blang et al, 1977;Hanallah and Rosales, 1979;Rapkin, 1972;Dumbar, 1961;Baxter, 1967). Some authors, however, consider the investigation unnecessary, and indeed dangerous, as it may delay the initiation of treatment (Davis, et al, 1981;Edelson, 1971;Poole and Altman, 1963;Rainer, 1971).…”