Tseng J, et al. - Given a recent decrease in the negative appendectomy rates (NAR: historically ranging from 15-25%), researchers sought the predictors of negative appendectomies. They compared patients with and without appendicitis on pathology, identified using the 2016 ACS-NSQIP database. 11,841 patients underwent appendectomies, with a NAR of 4.5%. CTs were noted to have the lowest negative appendectomy rates of all imaging modalities. Obtaining a CT in addition to an ultrasound is associated with lower NAR than obtaining ultrasound alone.