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Two days after going on multiple rides, including bungee-jumping, at an amusement park, a 16-year-old girl presented with right-sided abdominal pain and a low hematocrit. CT scan of the abdomen showed a large, smooth-walled mass in the right upper quadrant displacing the right kidney downward. There was extravasated fluid in the retroperitoneum and within Gerota’s fascia on the right side (see renal anatomy).