pharyngoepiglottic fold

Tumors of the posterior tonsillar pillar can extend inferiorly to involve the pharyngoepiglottic fold and the posterior aspect of the thyroid cartilage.

Pyriform sinus, extending from the pharyngoepiglottic fold to the upper end of the esophagus, bounded laterally by the thyroid cartilage and medially by the surface of the aryepiglottic fold and the arytenoid and cricoid cartilages.