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(A) Ultrasound of the left kidney, sagittal view, showing anechoic fluid-filled septated cystic spaces (arrows) insinuating the renal sinuses. The cyst on the left is an image of the largest cyst present in the kidneys, measuring 3.3 mm. (B) Ultrasound of the right kidney, transverse view, showing anechoic fluid-filled multi-septated spaces (arrows).
