PMC8590109_01
Post-PCND follow-up KUB show a new radiopaque lesion (arrow) in right kidney area.
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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).
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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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).
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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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).
The video image of fURS and the coiled element.
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The retrieved specimen from RIRS (12 cm).
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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.
Postoperative KUB showed disappearance of the radiopaque lesion at right kidney area. Right double J ureteral stent were in situ.
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Postoperative KUB revealed the disappearance of the radiopaque lesion in the right renal shadow (Figure 6).