Monday, October 8, 2012

Phantom Calyx

A phantom renal calyx refers to a calyx that does not opacify after administration of contrast due to obstruction or stricture at the infundibulum. The differential diagnosis for this finding includes:
  • neoplasm - most likely transitional cell carcinoma
  • infection - tuberculosis, acute pyelonephritis
  • stricture - due to trauma or passage of stone
  • renal contusion
  • ischemia/renal infarct
  • congenital anomaly

Dyer RB, Chen MY, Zagoria RJ. Classic signs in uroradiology. Radiographics 2004;24:S247-80.

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