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Query: UMLS:C0403608 (ureter)
 9,655 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Multicystic renal dysplasia in a crossed fused or nonfused ectopic kidney is a rare occurrence that produces unusual imaging findings. In four such cases in neonates, three presented with a palpable abdominal mass and one was discovered in utero with maternal sonography. In three cases, sonography showed a multicystic mass, contiguous with the lower pole of the orthotopic kidney. In the fourth infant, a crossed, tiny dysplastic kidney was not visualized, but its markedly dilated ectopic ureter was seen traversing the spine on CT. Ureteropelvic junction obstruction was present in the three fused orthotopic kidneys. The characteristic imaging findings of multicystic dysplasia and crossed renal ectopia include a multicystic mass of variable size that is contiguous with the lower pole of a hydronephrotic, malrotated kidney; ureteral displacement and/or dilatation; and contralateral absence of the kidney and its renal artery.
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PMID:Multicystic dysplasia and crossed renal ectopia. 330 Feb 26

Ureteropelvic junction obstruction of the upper pole moiety is reported in 2 patients with complete ureteral duplication. A normal upper pole ureter of a duplicated system in conjunction with upper pole dilatation should alert the urologist to the presence of an upper pole ureteropelvic junction obstruction. Traditional pyeloplasty techniques can be applied to this anomaly with successful salvage of renal parenchyma. The embryological implications of this combination of anomalies occurring in a single patient are discussed briefly.
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PMID:Ureteropelvic junction obstruction of the upper pole moiety in complete ureteral duplication. 373 17

Ureteropelvic junction obstruction is a congenital anomaly commonly afflicting the pediatric population, however, it is also more frequently than generally appreciated in the adult population. The method of postoperative urinary diversion - to divert by nephrostomy tube and/or splint or not to divert - was a matter of debate during the last twenty years. Through the application of microsurgery in pyeloplasty an external urinary diversion under commonly circumstances is not necessary. The Culp vertical flap pyeloplasty was modified by means of microsurgical instruments, ophthalmologic loupes (X 2, 6) and fine absorbable polyglactine sutures and used in 7 cases in 1984. The top of the flap is fixed in the distal ureteral incision by a U-shaped suture of 5-0 or 6-0 Vicryl followed by 2 continuous watertight sutures of the flap and the ureter and pyelon respectively. Only an extrarenal drainage for 4-8 days postoperatively was used. The mean duration of postoperative hospitalization was 10 days. The short-term radiographic, functional and clinical results after microsurgical pyeloplasty are excellent in 4 patients and good in 1 patient. The mean follow-up was only 4 months. Further experience, long-term follow-up and comparison with conventionally operated patients are necessary to evaluate the advantage of our microsurgical technique.
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PMID:[Use of microsurgery in the operative treatment of primary hydronephrosis]. 390 2

We reviewed our management of children with vesicoureteral reflux and ureteropelvic junction obstruction in the same renal unit. Of the children who underwent pyeloplasty for ureteropelvic junction obstruction 9 per cent also had vesicoureteral reflux. These children were almost exclusively boys. Ureteropelvic junction obstruction was caused mostly by a stricture or fixed kinks of the upper ureter. Vesicoureteral reflux was primarily grade IV and was associated with abnormal morphology of the ureteral orifice. Pyeloplasty was the initial surgical correction and ureteral reimplantation was performed expectantly.
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PMID:The management of children with vesicoureteral reflux and ureteropelvic junction obstruction. 670 90

Two examples of the rare case of complete duplicated collecting system with lower pole ureteropelvic junction obstruction are described. Ureteropelvic junction obstruction (UPJO) and duplicated collecting systems seldom occur in combination. Complete duplication of the ureter may be asymptomatic or recognized when complications develop as a result of reflux into the lower pole ureter or obstruction of the upper pole with an ectopic ureterocele. It is difficult to choose an optimal therapy due to the high variability in function, degree of obstruction, damage and potential for regeneration in growing kidneys. The diagnosis and management of UPJO of the lower pole in complete duplicated collecting systems are discussed.
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PMID:Duplicated collecting system with lower pole ureteropelvic junction obstruction. 1167 85

Ureteropelvic junction obstruction is usually intrinsic and is most common in children. Aberrant renal arteries are present in about 30% of individuals. Aberrant renal arteries to the inferior pole cross anteriorly to the ureter and may cause hydronephrosis. To the best of our knowledge, although there are some papers about aberrant renal arteries producing ureteropelvic junction obstruction, there is no report of a case which is diagnosed by the new modalities, such as computed tomography angiogram (CTA) or magnetic resonance angiogram (MRA). We describe a 36-year-old woman with right hydronephrosis. Kidney ultrasonogram and excretory urogram revealed right hydronephrosis. CTA and MRA clearly displayed an aberrant renal artery and hydronephrosis. The patient underwent surgical exploration. For the evaluation of hydronephrosis by an aberrant renal artery, use of CTA and MRA is advocated.
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PMID:Hydronephrosis by an aberrant renal artery: a case report. 1276 Feb 71

Ureteropelvic junction obstruction is a common cause of end-stage nephropathy in children. Our aim was to investigate whether relief of obstruction in utero can alleviate the development of nephropathy. A silastic tube was tied around the left superior segment ureter to induce unilateral partial ureteral obstruction in 22 fetal sheep at 75- 85 d of gestation. Three weeks later, the tubes were removed to relieve the obstruction in 10 of the 22 lambs. A sham operation was performed on four fetuses (the control). At birth, the lambs were killed, and their kidneys were removed to study the changes in histology, podocytes, and expression of paired-box 2 (PAX2) and VEGF. In the obstructed kidneys, we observed cysts of various sizes in the cortex, fibrosis in the interstitial tissue, much decreased number of glomeruli, severe podocyte foot process fusion, and markedly increased PAX2 and decreased VEGF expressions. However, relief of obstruction preserved the number of glomeruli, significantly increased VEGF expression, reduced fusion of the podocyte foot processes, andrestored expression of PAX2 to some extent. Thus, relief ofobstruction in utero may prevent or attenuate the development ofnephropathy in lambs.
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PMID:Does intervention in utero preserve the obstructed kidneys of fetal lambs? A histological, cytological, and molecular study. 1939 Apr 81

Ureteropelvic junction obstruction (UPJO) is characterized by impaired flow of urine from the renal pelvis to the ureter. Untreated disease can result in renal impairment making effective management crucial. A combination of CT imaging and diuretic renography is typically used for diagnosis. CT is the investigation of choice for obtaining anatomical information about UPJO and can help to identify potential causes. Diuretic renography is best for providing functional information about UPJO. A variety of open and minimally invasive surgical techniques are available for treatment of UPJO. Traditionally open pyeloplasty has been the standard of care but minimally invasive surgical techniques have become increasingly popular. Endopyelotomy has a lower success rate than other modalities (42-90% depending on the approach), but is associated with reduced pain and shorter convalescence. Laparoscopic pyeloplasty and robot-assisted pyeloplasty have similar success rates to open pyeloplasty (>90%), with the additional advantages of significantly reduced morbidity and shorter convalescence. More long-term outcome data for minimally invasive surgical techniques are awaited.
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PMID:Management of ureteropelvic junction obstruction in adults. 2528 85

Ureteropelvic junction obstruction due to intrinsic causes is often diagnosed antenatally during routine ultrasonography. Cases of extrinsic obstruction often present later and symptomatically, during childhood. We describe the rare case of an 8-year-old boy with a 2-day history of severe left flank pain, no fevers, and Society of Fetal Urology grade 3 hydronephrosis on ultrasonography. Laparoscopic dismembered pyeloplasty revealed a left ureteropelvic junction obstruction secondary to a large fibroepithelial polyp in the proximal ureter with a concomitant anterior crossing vein. We also provide a focused review of the pertinent published literature.
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PMID:Ureteropelvic Junction Obstruction by a Long Intraluminal Polyp and a Concurrent Crossing Vein in a Symptomatic 8-Year-old Child. 2619 55

Ureteropelvic junction obstruction (UPJO) is defined as an impedance in the normal flow of urine from the renal pelvis into the proximal ureter. This leads to an increase urine pressure in the pelvicalyceal system and as a consequence cause hydronephrosis and damage of renal parenchyma. Presence of anomalous vessels crossing the ureter (crossing vessels) is one of the many reasons of UPJ obstruction. We report a case of 32-year-old female patient with chronic abdominal pain and recurrent episodes of pyelonephritis in the past. Contrast enhanced URO-CT was performed in order to determine the cause of complaints. This examination revealed right pelvicalyceal system dilatation and ipsilateral UPJ obstruction. After urological consultation patient was qualified for surgery, which aimed to decompress right pelvicalyceal system by changing anatomical conditions between the ureter and presumably crossing vessels. We demonstrate in the described case the value of contrast enhanced computed tomography URO-CT) in the diagnostic process of UPJ pathology. A multitude of information that we obtain from URO-CT examination allows the surgeon to reveal the cause of abnormal urine flow and choose the optimal operating method to minimize the risk of adverse events (such as intraoperative bleeding from mutilated crossing vessels).
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PMID:[Computed tomography imaging in ureteropelvic junction obstruction--case report]. 2712 Sep 49


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