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Extrarenal Pyelocalyceal System

An extrarenal pyelocalyceal system is characterized by calyces and renal pelvis, which are not within the renal parenchyma. The pyelocalyceal system contacts only next to the papilla the renal parenchyma, the hilus is flat and wide. The extrarenal collecting system has usually no clinical significance.

Extrarenal pyelocalyceal system in crossed renal ectopia with hydronephrosis: there is a clear separation between renal parenchyma and pyelocalyceal system, the hydronephrosis is caused by a ureteropelvic junction obstruction. With kind permission of Dres. Trenschel, Engels, Kiebach, Kosch und Stahl, Radiologische Praxis Augsburg.

References

Malament, M.; Schwartz, B. & Nagamatsu, G. R.

Extrarenal calyces: their relationship to renal disease.
Am J Roentgenol Radium Ther Nucl Med, 1961, 86, 823-829

  Deutsche Version: Extrarenales Kelchsystem