Nasal Valve Anatomy: Internal vs. External Valve January 8, 2015 Dean Toriumi, MD discusses the difference between internal valve versus external valve collapse and the surgical options available for each. Related videos Webinar: LATERA and CPT code 30468Tricia Long, COPM Past president, ASCENT Webinar: LATERA 20mm implant & RCT dataJoshua Greene, MD Ascension St. Vincent Hospital Indianapolis, IN Video tags NAO LATERA nasal implant Nasal implant Nasal valve collapse