MRI of the abdomen of Case I° with a frontal cut of the two kidneys. An MRI of the abdomen showed a mildly enlarged appendix without surrounding edema and little free fluid in the pelvis. The kidneys showed mildly irregular signaling in the upper renal pole on both sides and the lower pole on the right side (cortical). Duplex sonography of the renal artery showed a laterally symmetrical resistance index normal for age.