Left flank pain
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The left kidney shows a middle zonal partially exophytic renal cyst measuring 4 cm, showing dependent dense calcific precipitate (milk of calcium). This density increases in the delayed phase by excreted contrast accumulation. Thread like connection to the middle calyx that may be the diverticular connection or a compressed nearby minor calyx.
The radiological features are representing mostly renal milk of calcium within a renal cyst in non-contrast phase. In excretory phase, the accumulation of contrast within the cyst augmenting the size of the dependent density represents a communication to the renal calyceal system and so it is considered as a calyceal diverticulum.