Calcifications in medullary sponge kidney
Plain film of the abdomen with tomography in a patient with medullary sponge kidney. There are clusters of calcium stones limited to the upper (not well seen) and lower calyces (arrows), which are the only involved pyramids.
From Rose, BD, Pathophysiology of Renal Disease, 2d ed, McGraw-Hill, New York, 1987.
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