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As a result, a T1 tumor can invade the mucous membrane and affect the extrinsic muscles without transforming into a T4a tumor. As extrinsic tongue muscles are peripheral and submucosal, the use of the term "deep" is erroneous, as is the systematic usage of extrinsic muscles to define T4a oropharyngeal cancers. This study attempts to explain this error, which is recurrent in the different editions of the Union for International Cancer Control and American Joint Committee on Cancer. As extrinsic tongue muscles are peripheral and submucosal,