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pt4a: tumor invades cricoid or thyroid cartilage and/or invades tissues beyond the larynx (e.g., trachea, soft tissues of the neck including deep extrinsic muscle of the tongue, strap muscles, thyroid, or esophagus) (larynx, subglottis)
pt4a: tumor que invade cartílago cricoides o tiroides y/o tejidos extralaríngeos (tráquea, partes blandas del cuello incluidos músculos extrínsecos profundos de lengua, músculos infrahioideos, tiroides o esófago (laringe, subglotis)