Abstract
Abstract Nasal obstruction may occur at the level of the external or internal nasal valve as well as more posteriorly due to septal or turbinate derangement (1). The external nasal valve comprises the alar cartilages, lateral nasal margin, and the columella. The internal nasal valve is the angle formed by the junction of the upper lateral cartilages, between the anterior end of the inferior turbinate and the nasal septum. The internal nasal valve is better-known and studied and is often simply referred to as the nasal valve. From the physiological point of view, it is the place of maximum nasal flow resistance or the flow-limiting segment. This article is protected by copyright. All rights reserved.
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