TNM classification and disease description in head and neck cancer.

The TNM concept is beset by frequent revisions, ambiguities, and incomplete coverage of tumor sites. A study comparing clinicians' classifications with computer-derived TNM classifications yielded discrepancies ranging from 44 per cent in T designations to 25 per cent in N designations, of which 35 per cent and 20 per cent, respectively, are ascribable to… (More)