Introduction: The external nasal valve insufficiency is related to factors that may incur in lack of nose side wall support. Resistance to collapse is determined by the strength and shape of the lower lateral cartilage (LLC) and also by its position. The LLC malposition was clinically described by Sheen, but Daniel later proposes that the evaluation should be performed during surgery, measuring the distance from the caudal edge of the lateral crus to the nostril's midpoint.