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TNM

staging system for the larynx

T1

tumor limited to one subsite of supraglottis with normal vocal cord mobility

T2

tumor invades mucosa of more than one adjacent subsite of supraglottis or glottis or region outside the supraglottis (like the base of the tongue) without fixation of the larynx

T3

tumor limited to larynx with vocal cord fixation and/or invades any of the following: postcricoid area, pre-epiglottic tissues

T4a

tumor invades through the thyroid cartilage, and/or invades tissues beyond the larynx (like the thyroid, esophagus)

T4b

tumor invades pre-vertebral space, encases carotid artery,or invades mediastinal structures

T1

tumor limited to vocal cord(s) with normal mobility

T1a

tumor limited to one vocal cord

T1b

tumor involves both vocal cords

T2

tumor extends to supraglottis and/or subglottis from the glottis with impaired vocal cord mobility

T3

tumor limited to the larynx with vocal cord fixation

T4a

tumor invades through the thyroid cartilage and/or invades tissues beyond the larynx (like the trachea)

T4b

tumor invades pre-vertebral space, encases carotid artery, or invades mediastinal structures

T1

tumor limited to the subglottis

T2

tumor extends to the vocal cord(s) with normal or impaired mobility

T3

tumor limited to larynx with vocal cord fixation

T4a

tumor invades through cricoid or thyroid cartilage and/or invades tissues beyond the larynx (like the trachea)

stage I

T1 N0 M0

stage II

T2 N0 M0

stage III

T3 N0 M0; T2 N1 M0; T3 N1 M0; T1 N1 M0

stage IVa

T4a N0 M0; T4a N1 M0; T1 N2 M0; T3 N2 M0; T4a N2 M0

supraglottis

region of the larynx that is composed of the epiglottis, and false vocal cords

glottis

region of the larynx composed of the true vocal cords

subglottis

region of the larynx extending from the lower boundary of the glottis to the lower margin of the cricoid cartilage

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