title: Staging system by sites. Problems and refinements.
abstract: Staging by sites has been met with varying degrees of acceptance by the medical community. Only painstaking application of these guidelines will provide the necessary information for revision of the present system.
mesh_terms: D006258:Head and Neck Neoplasms / Q000473:pathology*; D006801:Humans; D008207:Lymphatic Metastasis; D009362:Neoplasm Metastasis; D009367:Neoplasm Staging / Q000379:methods*