Phantom calyx is a calyx which fails to fill with contrast admist a well opacified remainder of pyelocalyceal system. It refers to an intrarenal process which has infilterated and caused obliteration of the involved collecting system element.
It may be seen in:
- tumour: especially transitional cell carcinoma of the renal pelvis.
- renal tuberculosis
- acute pyelonephritis
- renal calculus
- renal ischaemia
- renal trauma
- congenital anomaly
- renal contusion
- technical underfilling
If the calyx is dilated and filled with tumour (but still visible) then it is referred to as an oncocalyx.
- 1. Browne RF, Meehan CP, Colville J et-al. Transitional cell carcinoma of the upper urinary tract: spectrum of imaging findings. Radiographics. 25 (6): 1609-27. doi:10.1148/rg.256045517 - Pubmed citation
- 2. Brennan R, Pollack H. Nonvisualized (“phantom”) renal calyx: Causes and radiological approach to diagnosis. Urol Radiol. 1980;1 (1): 17-23. Urol Radiol (abstract) - doi:10.1007/BF02926595
- 3. Dyer RB, Chen MY, Zagoria RJ. Classic signs in uroradiology. Radiographics. 2004;24 Suppl 1 (suppl 1): S247-80. Radiographics (full text) - doi:10.1148/rg.24si045509 - Pubmed citation
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