40 results match your criteria nondilated collecting


Comparison of contrast-enhanced ultrasound versus conventional ultrasound-guided percutaneous nephrolithotomy in patients with nondilated collecting system: a randomized controlled trial.

Eur Radiol 2021 Feb 26. Epub 2021 Feb 26.

Department of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.

Objective: To compare the safety, effectiveness, and feasibility of contrast-enhanced ultrasound (CEUS) versus conventional ultrasound-guided percutaneous nephrolithotomy (PCNL) in patients with nondilated collecting system.

Methods: Between July 2018 and July 2020, 160 kidney stone patients with nondilated collecting system planned for PCNL were randomly assigned into two groups, CEUS with retrograde ureteral contrast injection and conventional ultrasound with retrograde ureteral normal saline injection. Patient's demographics, the success rate of puncture, success rate of a single-needle puncture, number of punctures, puncture time, perioperative outcomes, stone-free rate, and incidence of complications were compared. Read More

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February 2021

Assessment of the Contrast-Enhanced Ultrasound in Percutaneous Nephrolithotomy for the Treatment of Patients with Nondilated Collecting System.

J Endourol 2021 Apr 30;35(4):436-443. Epub 2020 Oct 30.

Department of Urology, The Second People's Hospital of China Three Gorges University, The Second People's Hospital of Yichang, Yichang, China.

To investigate the clinical value of contrast-enhanced ultrasound (CEUS) in percutaneous nephrolithotomy (PCNL) for kidney stone patients without hydronephrosis. Patients with nondilated collecting system kidney stones who underwent PCNL between October 2018 and December 2019 at our hospital were enrolled in this study. Patients who met the inclusion criteria were randomized into two groups: a CEUS-guided PCNL group and a conventional ultrasound (US)-guided PCNL group. Read More

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Management of non-vascular complications following renal transplantation using percutaneous approach.

Ann Ital Chir 2018 ;89:86-91

Objective: Non-vascular complications following renal transplantation can cause graft failure. In this study, we present our two-year experience with percutaneous treatment for non-vascular complications following renal transplantation.

Patients And Methods: A total of 30 patients who underwent percutaneous radiological treatment between March 2014 and July 2016 were included in the study. Read More

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November 2018

Percutaneous Nephrolithotomy Puncture and Tract Dilation: Evidence on the Safety of Approaches to the Infundibulum of the Middle Renal Calyx.

Urology 2017 Sep 16;107:43-48. Epub 2017 Jun 16.

Department of Urology, University of Patras, Patras, Greece; Department of Urology, Medical University of Vienna, Vienna, Austria.

Objective: To investigate the anatomical relations of the papillary, infundibular, and pelvic approach to percutaneous nephrolithotomy and evaluate the amount of vascularization at the respective sites.

Materials And Methods: Tc-dimercaptosuccinic acid single-photon emission computed tomography/computed tomography (SPECT/CT) renal scintigraphies or computed tomography perfusion (CTP) was performed in 40 patients (prone n = 20 or supine position n = 20). The angle of approach (AoA) for access tracts and the respective regions of interest to the mid-calyceal papilla and infundibulum as well as renal pelvis were designed and compared. Read More

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September 2017

Contrast-enhanced US-assisted Percutaneous Nephrostomy: A Technique to Increase Success Rate for Patients with Nondilated Renal Collecting System.

Radiology 2017 10 3;285(1):293-301. Epub 2017 May 3.

From the Department of Medical Ultrasonics, Division of Interventional Ultrasound, Institute of Diagnostic and Interventional Ultrasound (B.X.L., G.L.H., X.H.X., B.W.Z., X.Y.X., M.D.L.), and Department of Liver Surgery (M.D.L.), the First Affiliated Hospital, Sun Yat-Sen University, 58 Zhong Shan Road 2, Guangzhou 510080, China.

Purpose To perform a single-center study of contrast material-enhanced ultrasonography (US)-assisted percutaneous nephrostomy (PCN) for patients with nondilated renal collecting system. Materials and Methods An international review board approved this retrospective study with waiver of informed consent for participation, and the study was approved by the Ethical Committee. From November 2011 to September 2015, 47 patients (mean age, 51. Read More

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October 2017

Ultrasound-Guided Renal Access and Tract Dilation.

Videourology (New Rochelle) 2017 8;31(1). Epub 2017 Feb 8.

Department of Urology, University of California, San Francisco, San Francisco, California.

Ultrasound guidance is a unique alternative to fluoroscopy for percutaneous renal access. Besides being free of ionizing radiation exposure to the patient and intraoperative personnel, it offers several advantages including easier identification of the posterior renal calix and surrounding visceral structures. In this video, we demonstrate how ultrasound can be used to guide percutaneous nephrolithotomy (PCNL) in a step-by-step manner. Read More

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February 2017

Feasibility of Retrograde Ureteral Contrast Injection to Guide Ultrasonographic Percutaneous Renal Access in the Nondilated Collecting System.

J Endourol 2017 02 30;31(2):129-134. Epub 2016 Nov 30.

1 Department of Urology, University of California , San Francisco, San Francisco, California.

Objectives: Ultrasound-guided percutaneous nephrolithotomy (PCNL) has become increasingly utilized. Patients with nondilated collecting systems represent a challenge: the target calix is often difficult to visualize. Here we report pilot study results for retrograde ultrasound contrast injection to aid in percutaneous renal access during ultrasound-guided PCNL. Read More

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February 2017

Impaired epithelial Na+ channel activity contributes to cystogenesis and development of autosomal recessive polycystic kidney disease in PCK rats.

Pediatr Res 2015 Jan 3;77(1-1):64-9. Epub 2014 Oct 3.

Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin.

Background: Autosomal recessive polycystic kidney disease is a genetic disorder characterized by the development of renal cysts of tubular epithelial cell origin. Epithelial Na(+) channel (ENaC) is responsible for sodium reabsorption in the aldosterone-sensitive distal nephron. Here, we investigated the ENaC expression and activity in cystic tissue taken from rats with autosomal recessive polycystic kidney disease. Read More

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January 2015

Percutaneous access of nondilated renal collecting systems.

Semin Intervent Radiol 2014 Mar;31(1):98-100

Department of Radiology, School of Medicine, University of Colorado, Aurora, Colorado.

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Nephrostomy in early posttransplantation period in patients with nonfunctional graft and nondilated collecting system.

Cardiovasc Intervent Radiol 2014 Apr 14;37(2):458-62. Epub 2013 Jun 14.

Department of Diagnostic and Interventional Radiology, Institute for Clinical and Experimental Medicine, Vídeňská 1958/9, 14021, Prague 4, Czech Republic,

Background: The purpose of our study was to determine whether renal function can be restored by early nephrostomy in patients who fail to develop renal function immediately after transplantation.

Methods: Between 2001 and 2010, we have performed external/internal nephrostomy in 13 patients during the early posttransplant period. The reason for the procedure was graft nonfunction with oliguria/anuria in the presence of normal renal perfusion, absence of signs of rejection, and/or renal collecting system dilation. Read More

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TRPV4 dysfunction promotes renal cystogenesis in autosomal recessive polycystic kidney disease.

J Am Soc Nephrol 2013 Mar 14;24(4):604-16. Epub 2013 Feb 14.

Department of Integrative Biology and Pharmacology, University of Texas Health Science Center at Houston, 6431 Fannin, Houston, TX 77030, USA.

The molecular mechanism of cyst formation and expansion in autosomal recessive polycystic kidney disease (ARPKD) is poorly understood, but impaired mechanosensitivity to tubular flow and dysfunctional calcium signaling are important contributors. The activity of the mechanosensitive Ca(2+)-permeable TRPV4 channel underlies flow-dependent Ca(2+) signaling in murine collecting duct (CD) cells, suggesting that this channel may contribute to cystogenesis in ARPKD. Here, we developed a method to isolate CD-derived cysts and studied TRPV4 function in these cysts laid open as monolayers and in nondilated split-open CDs in a rat model of ARPKD. Read More

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MR imaging guided percutaneous nephrostomy using a 1.0 Tesla open MR scanner.

Cardiovasc Intervent Radiol 2011 Aug 16;34(4):857-63. Epub 2010 Dec 16.

Department of Radiology, Otto von Guericke University, Medical School, Leipziger Str. 44 39120, Magdeburg, Germany.

Purpose: The purpose of this study was to assess the safety and feasibility of MR-guided percutaneous nephrostomy (PCN) using a 1.0 Tesla open MR-scanner with fast dynamic imaging.

Methods: Twenty-five patients with failed ultrasonographic insertion due to various reasons, such as nondilated pelvic systems, obesity, and parapelvic cysts, were investigated. Read More

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A proposed new classification for the renal collecting system of cattle.

Am J Vet Res 2010 Nov;71(11):1264-9

State University of Rio de Janeiro, Brazil.

Objective: To evaluate the intrarenal anatomy of kidneys obtained from cattle and to propose a new classification for the renal collecting system of cattle.

Sample Population: 37 kidneys from 20 adult male mixed-breed cattle.

Procedures: Intrarenal anatomy was evaluated by the use of 3-D endocasts made of the kidneys. Read More

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November 2010

Preventing surgically induced diabetes after total pancreatectomy via autologous islet cell reimplantation.

AORN J 2010 Aug;92(2):169-81; quiz 182-3

Medical University of South Carolina, Charleston, USA.

Total pancreatectomy may be the only treatment option that relieves pain and tissue destruction for patients with chronic pancreatitis, but this procedure causes surgically induced diabetes, which is difficult to manage because of the absence of insulin-producing beta cells. Some patients may benefit from autologous islet cell reimplantation, a procedure that involves collecting and purifying the islets of Langerhans from the patient's own resected pancreas and reinfusing them into the patient via the portal vein. Typically, candidates for this procedure are younger adults with nondilated pancreatitis that has yet to develop into glucose intolerance. Read More

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MRI-guided percutaneous nephrostomy: a feasibility study.

Eur Radiol 2009 May 26;19(5):1296-301. Epub 2008 Nov 26.

Department of Radiology, Oulu University Hospital, PO Box 50, 90029 Oulu, Finland.

The purpose of this study was to assess the feasibility and safety of magnetic resonance imaging (MRI)-guided PCN in an open-configuration low-field MRI system. Eight patients were prospectively enrolled in the study. The degree of the dilatation of the renal collecting system varied from minimal to severe. Read More

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Retrograde endoscopic-assisted percutaneous renal access: a novel "lasso" technique to achieve rapid secure access to the collecting system.

J Endourol 2008 Apr;22(4):591-6; discussion 596

Image-guided percutaneous renal access for placement of an access sheath for percutaneous nephrolithotomy can be a challenging procedure, especially in patients with nondilated collecting systems, obstructed infundibula (stones or stricture), or extreme body habitus. We describe our experience using ureteroscopy along with a zero-tip stone basket to facilitate a through-and-through (percutaneous-urethra) access to the collecting system. Read More

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MR urography: techniques and clinical applications.

Radiographics 2008 Jan-Feb;28(1):23-46; discussion 46-7

Department of Radiology, Wake Forest University School of Medicine, Medical Center Blvd, Winston-Salem, NC 27157, USA.

Magnetic resonance (MR) urography comprises an evolving group of techniques with the potential for allowing optimal noninvasive evaluation of many abnormalities of the urinary tract. MR urography is clinically useful in the evaluation of suspected urinary tract obstruction, hematuria, and congenital anomalies, as well as surgically altered anatomy, and can be particularly beneficial in pediatric or pregnant patients or when ionizing radiation is to be avoided. The most common MR urographic techniques for displaying the urinary tract can be divided into two categories: static-fluid MR urography and excretory MR urography. Read More

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February 2008

Use of lower pole nephrostomy drainage following endorenal surgery through an upper pole access.

J Urol 2006 Feb;175(2):580-4; discussion 584

Methodist Hospital Institute for Kidney Stone Disease, Indianapolis, Indiana, USA.

Purpose: PNL via an UP puncture is efficient for treating complex stone disease. Access via the UP can provide better visualization, allowing greater stone clearance with a rigid instrument due to its more favorable alignment with the axis of the intrarenal collecting system. However, the presence of a NT through the upper pole tract, especially with a supracostal puncture, can generate significant patient discomfort. Read More

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February 2006

Percutaneous nephrostomy of nondilated renal collecting systems with fluoroscopic guidance: technique and results.

Radiology 2004 Oct 27;233(1):226-33. Epub 2004 Aug 27.

Department of Radiology, St George's Hospital, Blackshaw Rd, London SW11 5PF, England.

Purpose: To retrospectively review experience with a double-puncture technique for percutaneous nephrostomy of nondilated renal collecting systems.

Materials And Methods: Over a 5-year period, 15 patients (26 kidneys) without calyceal dilatation at ultrasonography (US) who required nephrostomy drainage were studied. Eleven patients (21 kidneys) had ureteral leaks or fistulas, one patient (one kidney) had a renal pelvic stone, one patient (one kidney) was suspected of having a ureteral tumor, and the final two patients (three kidneys) had acute nondilated renal failure. Read More

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October 2004

Use of a ureteral access sheath to facilitate removal of large stone burden during extracorporeal shock wave lithotripsy.

Urology 2004 Mar;63(3):574-6

Department of Urology, New York-Presbyterian Hospital, Columbia University College of Physicians and Surgeons, New York, New York 10032, USA.

Large renal stone burdens within a nondilated collecting system in patients with a relative contraindication to percutaneous nephrolithotomy can be a challenging problem. We describe a novel technique using a ureteral access sheath combined with extracorporeal shock wave lithotripsy to facilitate passage of stone fragments in such patients. Read More

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Diuretic contrast-enhanced magnetic resonance urography versus intravenous urography for depiction of nondilated urinary tracts.

Abdom Imaging 2003 Jan-Feb;28(1):135-45

Department of Radiology, Urology and Nephrology Center, Mansoura University, Mansoura, Egypt.

Diuretic contrast-enhanced magnetic resonance urography (MRU) is analogous to conventional intravenous urography (IVU) and, hence, designated as excretory MRU. It is performed with a T1-weighted fast gradient-echo sequence to obtain breath-hold, dynamic MRU after intravenous injection of low-dose furosemide (5-10 mg) and gadolinium (Gd) chelate. The combination of Gd and furosemide is the key for achieving a uniform distribution of the contrast material inside the entire urinary tract. Read More

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MR urography: examination techniques and clinical applications.

Eur Radiol 2001 ;11(3):355-72

Department of Diagnostic Radiology, University of Technology, Aachen, Germany.

Modern MR urography is performed on the basis of two different imaging strategies, which can be used complementarily to cover almost all aspects in the diagnosis of upper urinary tract diseases. The first technique utilizes unenhanced, heavily T2-weighted pulse sequences to obtain static-fluid images of the urinary tract. T2-weighted MR urograms have proved to be excellent in the visualization of the markedly dilated urinary tract, even if the renal excretory function is quiescent. Read More

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Magnetic resonance imaging in the assessment of urologic disease: an all-in-one approach.

Eur Radiol 2000 ;10(10):1614-9

Department of Radiology, University Hospitals, Catholic University of Leuven, Belgium.

The aim of this study was to evaluate an "all-in-one" MR procedure to examine the kidneys, the renal vascular supply and renal perfusion, and the urinary tract. In 64 patients (58 with urologic disease and 6 healthy volunteers), MR was performed including: (a) T1- and T2-weighted imaging; (b) 3D contrast-enhanced MR angiography (MRA), including the renal arteries, renal veins, as well as renal perfusion; and (c) 3D contrast-enhanced MR urography (MRU) in the coronal and sagittal plane. For the latter, low- and high-resolution images were compared. Read More

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February 2001

Feasibility and utility of respiratory-gated, gadolinium-enhanced T1-weighted magnetic resonance urography in children.

Invest Radiol 2000 Aug;35(8):504-12

Department of Diagnostic Radiology, University Hospital of the RWTH, Aachen, Germany.

Rationale And Objectives: To evaluate the feasibility and utility of respiratory-gated, gadolinium-enhanced T1-weighted magnetic resonance (MR) urography in children.

Methods: In a prospective study, 30 consecutive children, aged 3 weeks to 13.8 years, underwent MR urography. Read More

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MR imaging-guided percutaneous nephrostomy and use of MR-compatible catheters in the nondilated porcine urinary tract.

J Vasc Interv Radiol 1999 Nov-Dec;10(10):1305-14

Department of Diagnostic Radiology, University of Technology, Aachen, Germany.

Purpose: To investigate technique and practicability of MR-guided percutaneous nephrostomy (MRPCN) and to test magnetic resonance (MR)-compatible catheters inside the urinary tract.

Materials And Methods: In 10 healthy pigs, a percutaneous nephrostomy tube was placed into the nonobstructed pelvicaliceal system with use of exclusive MR guidance with a standard 1.5-T magnet. Read More

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January 2000

MR-guided percutaneous nephrostomy of the nondilated upper urinary tract in a porcine model.

AJR Am J Roentgenol 1999 May;172(5):1221-5

Department of Radiology, University Hospitals of Cleveland/Case Western Reserve University, OH 44106, USA.

Objective: The purpose of this study was to assess the safety and feasibility of MR-guided percutaneous nephrostomy of the nondilated contrast-enhanced upper urinary tract in a porcine model.

Subjects And Methods: Six MR-guided percutaneous nephrostomies of the nondilated upper urinary tract were performed in four domestic farm pigs (body weight range, 20-25 kg) using a 0.2-T system. Read More

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[MRI-guided percutaneous nephrostomy of the contrast-enhanced, nondilated upper urinary tract: initial experimental results].

Rofo 1998 Jun;168(6):616-20

Klinik für Radiologische Diagnostik, RWTH Aachen.

Purpose: To evaluate technique and practicability of MR-guided percutaneous nephrostomy (MRPCN) in an animal model.

Methods: In three domestic pigs, a unilateral percutaneous nephrostomy tube was placed into the nondilated collecting system using exclusively MR-guidance with a standard 1.5 T scanner. Read More

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[T1-weighted excretory MR urography using GD-DTPA after low-dose diuretic administration].

Rofo 1997 Sep;167(3):314-8

Klinik für Radiologische Diagnostik, Universitätsklinikum der RWTH Aachen.

Purpose: Assessment of the morphology of the urinary tract by gadolinium (Gd)-enhanced T1-weighted MR-urography (MRU) and precontrast diuretic injection.

Methods: MRU was performed in 5 patients using Gd-DTPA-enhanced coronal T1-weighted 3D-gradient-echo sequences with different spatial resolution. Prior to contrast injection, 10 mg of furosemide were administered intravenously. Read More

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September 1997

Improved sonographic visualization by fluid challenge method of renal lithiasis in the nondilated collecting system. Experience in seven cases.

Authors:
W K Chau S C Chan

Clin Imaging 1997 Jul-Aug;21(4):276-83

Department of Medicine, Central Clinic and Hospital, Taipei, Taiwan, Republic of China.

Ultrasound is an effective means of detecting renal stones in patients with hydronephrosis. The filled urinary bladder in a normal person under hydration frequently results in the sonographic appearance of minimal or moderate hydronephrosis. For optimal visualization of stones and associated acoustic shadows, six patients with radiographically opaque renal stones were evaluated with fluid-loaded renal ultrasonography, which was compared to conventional renal sonogram in basal state. Read More

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Retrograde nephrostomy: advantages, disadvantages, and the learning curve.

J Endourol 1995 Dec;9(6):461-3

Department of Urology, Baylor College of Medicine, Houston, TX, USA.

Establishment of a nephrostomy tract is a prerequisite for many endourologic procedures of the upper urinary tract. We reviewed our initial experience with 31 retrograde nephrostomies to determine the advantages and disadvantages and the learning curve for the procedure. All but one of the attempts were successful, and no complications were attributable to the nephrostomy puncture. Read More

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December 1995