PMC6340374_01
(a) Preoperative CT scan (red arrow shows the stone); (b) preoperative CT scan (red arrow shows the retrocaval ureter).
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A direct abdomen CT scan (Fig. 1) showed an 8 mm ureteral stone with suspected retrocaval course of right proximal ureter with no hydronephrosis.
Right retrograde pyelography.
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After spinal anesthesia, a semirigid ureteroscopy after a right retrograde pyelography was performed (Fig. 2).
Retrograde flexible ureteroscopy.
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The stone was easily found in an inferior calix (Fig. 3) and taken off with a Zero Tip nitinol basket without intrarenal lithotripsy.