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case_images: Post-PCND follow-up KUB show a new radiopaque lesion (arrow) in right kidney area.
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case_images: A plain radiograph of the kidneys, ureters, and bladder (KUB) showed a new radiopaque lesion in the right renal shadow compared with the pre-PCND plain film (Figure 1).
case_images: Computed tomography image of the intrarenal foreign body (arrow) and its relationship with right double J ureter stent (arrowheads). (a) Transverse cut, (b) coronal cut, and (c) reconstruction.
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case_images: Further CT imaging was performed to determine the precise anatomical location and the radiodensity of the object, which was revealed to be a curvilinear hyperdense coil within the upper pole parenchyma of the right kidney (Figure 2a-c).
case_images: The video image of fURS and the laser probe (arrow) for cutting the underlying renal parenchyma for exposure of the embedded material.
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case_images: A Holmium-YAG Laser (Lumenis  VersaPulse  PowerSuite  200 mum laser system, 1.5 J and 20 Hz) was used to cut through the pit defect and the underlying renal parenchyma to gradually expose the embedded foreign body (Figure 3).
case_images: The video image of fURS and the coiled element.
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case_images: The retrieved specimen from RIRS (12 cm).
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case_images: The specimen was a 12 cm long tube-like object (Figure 5), which was determined to be with the coating layer of a guidewire, which had broken during the previous CT-guided PCND. The procedure was completed by careful hemostasis and the placement of a 4.7 French-22 cm (Cook Medical) double J ureteral stent.
case_images: Postoperative KUB showed disappearance of the radiopaque lesion at right kidney area. Right double J ureteral stent were in situ.
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case_images: Postoperative KUB revealed the disappearance of the radiopaque lesion in the right renal shadow (Figure 6).