Figure 1: Presentation of the external and internal nasal valve: The external nasal valve is located in the area of the nostrils and is limited in the lateral direction by the caudal portion of the alar cartilage with the connected soft parts and in the medial direction by the columella. The internal nasal valve is an elongated opening. It is located in the upper area of the nasal valve area between the anterior septum and the caudal lateral cartilage.