The rationale for partial laryngectomy is based on the embryological and anatomical features of the larynx, which Pressman [6] and Shumrich [7] clarified based on experimental results that the larynx is composed of several anatomical parts of different origins with left-right symmetry. The supraglottic region is derived from the buccopharyngeal germinal base, and the glottic and infraglottic regions are derived from the tracheo-cheek germinal base, and each of the left and right halves develops separately during the embryonic period and unites in infancy. Thus, from an anatomical point of view, the larynx is composed of four disconnected parts, upper, lower, left and right, and these united surfaces of different origins form the anatomical barrier of the laryngeal body. Cancer tends to occur in one anatomical site gradually expanding to other anatomical sites or favoring one side. Even in advanced stages, it is rare that all anatomical areas on both sides of the larynx are infiltrated. The normal laryngeal tissues that are not infiltrated are preserved and repaired to restore some or all of the larynx functions.