Fig. 5

A case in which TOVS was performed for a tumor on the pyriform sinus. a CT image under Valsalva maneuver showing a T1 tumor on the right pyriform sinus of the hypopharynx. b Transnasal endoscopic view of the tumor under Valsalva maneuver. c Endoscopic view of the tumor just before resection. d Endoscopic view of the wound just after resection. Thyroid cartilage was partially exposed (arrow heads). e Section of the tumor specimen stained with hematoxylin and eosin. f Macroscopic view of the tumor specimen resected. g Transnasal endoscopic view of the hypopharynx 3 months after resection