Megacalycosis | Figure 1

CincyKidsRad

Cincinnati Children's Radiology

Megacalycosis

An image of the kidney after a retrograde pyelogram shows a filling defect (arrow) within the markedly dilated lower pole renal collecting system. The patient was diagnosed as megacalycosis, a nonobstructive dilation of the renal calyces. Megacalycosis typically affects one kidney. While this condition is associated with marked dilation of the calyces, there is often no dilation of the renal pelvis or ureter. Megacalycosis is associated with stone formation.

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