Renal milk of calcium cyst
Discussion:
Key learning points:
- typically an incidental finding that does not require further treatment
- most frequently seen in calyceal diverticulae but can also occur in renal cysts
- on abdominal radiographs has a "full moon" appearance on supine projections, which changes "half moon" appearance on erect project
- on ultrasound has dependent echogenic material within a hypoechoic cyst
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