In the Original Investigation entitled “The Use of Magnetic Resonance Imaging in the Diagnosis of Suspected Appendicitis in Pregnancy: Shortened Length of Stay Without Increase in Hospital Charges” published online May 28, 2014, in JAMA Surgery (doi:10.1001/jamasurg.2013.4658), incorrect information appeared. In Table 3, the number (percentage) of patients in the MR Imaging group who underwent operative exploration should have read 12 (39%). On page E4, the second sentence of the first full paragraph should have read: “Patients without MR imaging had a higher percentage of operative exploration (61% [27 of 44] vs 39% [12 of 31]), which approached statistical significance (odds ratio [OR], 0.45; 95% CI, 0.18-1.16; P = .07).” This article was corrected online.