A “phantom” calyx refers to the imaging finding of lack of contrast opacification of a calyx or portion of the collecting system, where one should be, within an otherwise well-opacified pelvicalyceal system [1]. This appearance most often reflects a process that has infiltrated or obliterated the collecting system element [1]. The appearance was initially described on excretory urography (EXU) [1], but it may also be appreciated on retrograde pyelography (Fig. 1), and CT and MR urography (Fig. 2). The phantom calyx may be caused by tumor (especially urothelial carcinoma of the renal pelvis), infection (especially renal tuberculosis), edema from acute pyelonephritis, stricture related to renal calculus disease or trauma, renal ischemia, renal contusion, a congenital anomaly of the collecting system, or technical under filling during a procedure[1‐3].
×
×
…
Anzeige
Bitte loggen Sie sich ein, um Zugang zu diesem Inhalt zu erhalten