Recent AJCC Version 9 Staging of Nasopharyngeal Cancer

The recently revised American Joint Committee on Cancer Version 9 staging system for nasopharyngeal cancer reflects advances in high-resolution imaging techniques and aims for more detailed risk stratification. Key revisions include the requirement of unequivocal cortical bone destruction or marrow infiltration for T3 category and the introduction of imaging criteria for extranodal extension in the N3 category. Additionally, the M category was subdivided based on the number of distant metastatic lesions. These changes highlight the importance of accurate evaluations using CT, MRI, and PET. This review details the updated criteria and radiological considerations that support accurate imaging interpretation and staging.