Difference between a double J ureteral stent and a nephroureteral stent All ureteral stents are made of polyurethane or silicone; metallic stents are not used in ureters. A double-J ureteral stent is completely internal and has a “pigtail” at each end. Its proximal coil is situated in the renal pelvis, and its distal coil is …
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What are the indications for ureteral stenting? Common indications include presence of urinary tract calculi and benign ureteral strictures. Ureteral stenting is also indicated in patients with extrinsic ureteral obstruction, ureteral trauma, and retroperitoneal fibrosis. In the setting of malignant ureteral obstruction, stenting may be performed if the patient does not have bladder outlet obstruction. …
How are calculi removed during percutaneous treatment of the urinary tract? Different devices can be used through the endoscope when access to the collecting system has been obtained. These include various stone baskets, which are three to eight wires arranged in a helical pattern. Forceps may be used to grab individual calculi. US and electrohydraulic …
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What is the role of PCN in percutaneous treatment of urinary tract calculi? PCN is used to obtain a tract through which the endoscope may access the collecting system. It is important in this situation to create a tract that is straight and permits endoscope access to all portions of the collecting system.
What imaging modalities can be used to perform a percutaneous drainage of renal or perinephric abscesses? Percutaneous drainage of renal and perinephric abscesses can be performed with US, CT, or fluoroscopic guidance. US is usually preferred because it provides real-time imaging, which allows for an accurate, safe, and fast procedure. It is important to place …
When is percutaneous management of urinary tract calculi preferred over ESWL extracorporeal shock wave lithotripsy? ESWL is the sole therapy used in approximately 90% of patients with symptomatic urinary tract calculi. Percutaneous management is preferred, however, in patients with a large stone burden. Percutaneous management may also be used as an adjunct to ESWL if …
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What are the possible complications resulting from percutaneous drainage of renal or perinephric abscesses? Percutaneous drainage is a safe and effective technique that can be used in the management of an abscess. Complications may still occur, however. When collections adjacent to or within the kidney are being drained, some infected material may intravasate into the …