“…(Aframian, Keshet, & Nadler, 2018;Koch & Iro, 2017;Koch, Kunzel, Iro, Psychogios, & Zenk, 2014;Zhang et al, 2019) Existing grading systems based on sialography have employed inconsistent terminology to define ductal anatomy and fail to define the location and severity of ductal pathology. (Blatt et al, 1956;Zhang et al, 2019;Zou, Wang, Zhu, Wu, & Yu, 1992) Several grading systems have been reported that are based on sialendoscopy, which provides a limited view of the ductal system due to the inability to image beyond severe stenoses that may occur in the main duct. (Koch & Iro, 2017;Marchal et al, 2008) Additionally, tertiary ducts and acini cannot be evaluated with sialendoscopy.…”