PMC5628562_01
CT (coronal plane). Left renal stone.
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The patient is a 53-year-old male with a dense (1370 HU) 7 mm calculus in the upper calyx of the left kidney treated with fURS (Fig. 1).
X-ray film of impacted flexible ureteroscope in the distal ureter and possible mechanism of impaction.
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Therefore, we proposed the following mechanism: stone fragments were abutting the coating at the distal end of the ureteroscope and the ureteral wall as shown in Figure 2.
Mechanism of instrument retrieval.
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Gentle rotational, back and forth maneuvers under direct visual control were attempted with moderate application of traction (Fig. 3).