Milk of calcium renal cyst
Known urolithiasis, microhaematuria.
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Non-enhancing lesion adjacent to a renal calyx, that mainly shows homogeneously hyperdense attenuation values with some sedimented denser gravel or debris. There is also a small calculus in the lower calyx, best seen on the MIP.
Milk of calcium cysts of the kidneys are rare. They typically arise in calyceal diverticula and contain a suspension of crystals. Sedimentation of denser material is a typical feature, but may be missed after a change of position (as in CT). Treatment is normally not necessary, but they have to be differentiated from calculi within the collecting system1.