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

Involvement of the urethra or distal ureter in 30 to 50 per cent of the patients with carcinoma in situ of the bladder is well known. Carcinoma in situ of the bladder extending to the seminal vesicles rarely has been mentioned. We discuss 2 patients with extension of carcinoma in situ into the seminal vesicles and replacement of the normally present cylindroid mucosal lining. Carcinoma in situ of the ureter, bladder and prostatic ducts also was present in both patients.
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PMID:Carcinoma in situ of the bladder extending into the seminal vesicles. 379 65

In all 16 boys with posterior urethral obstruction, bilateral ureteral dilatation and chronic renal failure (serum creatinine above 2 mg/dl), who were seen during the last 12 years in our departments, data about time and outcome of urological therapeutic interventions (nephrectomy, relief of bladder outflow obstruction and ureter reimplantation) were analysed retrospectively. In five patients surgical treatment was performed in our hospital, the other 11 children were referred from other hospitals. Nephrectomy of a small but not functionless kidney was performed in three of four patients without proper indication. Bladder outflow obstruction was relieved too late in five patients and insufficiently in four. 36 ureter reimplantations were performed on 24 ureters in 14 patients; reimplantation was unsuccessful in 26 ureters (72%) either because of postoperative reflux (11 ureters) or because of postoperative obstruction (15 ureters). In our opinion in boys with posterior urethral valves and bilateral ureteral dilatation ureter reimplantation should be limited to patients with proven obstruction at the uretero-vesical junction.
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PMID:[Children with posterior urethral valves, dilatation of both ureters and chronic kidney insufficiency. A retrospective analysis of effectiveness and risk of operative measures]. 403 98

In this discussion I have excluded consideration of the genetics of purely renal malformations, such as polycystic kidneys, and of functional disorders of the kidney. Systematic family studies are available for renal agenesis, duplication of the ureters, vesico-ureteric reflux (each probably due to maldevelopment of the ureteric bud), bladder exstrophy and hypospadias as isolated malformations. Renal agenesis has a birth frequency of about 1.2 in 10 000 and the proportion affected of sibs is about 3 per cent. Duplication of the ureter has a birth frequency of about 1 per cent and the proportion affected of sibs and parents of probands is about 12 per cent. Vesico-ureteral reflux also has a prevalence in early childhood of about 1 per cent and the proportion of sibs affected is about 10 per cent. Bladder exstrophy has a birth frequency of about 1 in 20 000 and perhaps about 1 per cent of sibs are affected. Hypospadias has a birth frequency in boys of about 1 in 300 and the proportion affected of brothers is about 10 per cent. Further family studies are needed of these malformations when they occur in isolation. Either the multifactorial threshold model or dominant inheritance with reduced penetrance and varied expressivity would fit the data available.
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PMID:The genetics of urinary tract malformations. 673 26

Four techniques of intracorporeal lithotripsy are now available: ballistic, ultrasonic, electrohydraulic, and laser. Their therapeutic efficacies have generally been evaluated and compared, but very few data have been available on their relative risks of iatrogenic trauma to the urothelial wall. We conducted a comparative analysis of this risk by testing the pig ureteral and bladder wall with the EMS Lithoclast, Olympus ultrasonic lithotripter, Walz Lithotron EL 23, and Versa Pulse Ho:YAG Coherent Laser. We measured the number of shockwaves or the energy required to perforate the ureter and bladder by delivering shocks perpendicular to the walls. Ureteral perforation was impossible with the 1.0-mm Lithoclast transducer and the 1.5-mm ultrasound transducer. Perforation was induced after 250 shocks with the 0.8-mm Lithoclast transducer, after 110 shocks with the 3F electrohydraulic electrode, and after 0.02 kJ with the laser. Bladder perforation was impossible with the 2.0-mm Lithoclast device and the 3.4-mm ultrasound transducer but was induced after 0.04 kJ had been delivered with the laser. We evaluated the iatrogenic risk under normal conditions of use by delivering the shocks tangentially to the ureteral wall and perpendicular to the bladder wall. We sacrificed animals on days 0, 1, and 6. The immediate histologic lesions induced by the Lithoclast and the ultrasound lithotripter were similar, consisting of a moderate reduction of the epithelial layers or intraepithelial detachments. Electrohydraulic shocks induced almost complete abrasion of the urothelium, and the laser induced extensive lesions of partial or complete necrosis of the urothelial wall.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Ureteral and bladder lesions after ballistic, ultrasonic, electrohydraulic, or laser lithotripsy. 798 40

Bladder reconstruction in children attempts to provide for a low pressure reservoir of urine that is continent and may be emptied completely at appropriate intervals. The most common underlying causes of bladder dysfunction that may require reconstruction include neuropathic bladders associated with spina bifida, posterior urethral valves, and bladder exstrophy. Indications and patient selection for reconstruction have greatly improved and a variety of methods are available; each with its own advantages and drawbacks. The recent increased application of gastric segments in augmenting the bladder to increase size and compliance has been very successful, and particularly in patients with impaired renal function. The continent catheterizable stoma (Mitrofanoff principle), using appendix or ureter, has gained widespread acceptance in reconstructive procedures and provides a reliable, convenient, and well-accepted means of achieving continence. Although advances have been made in reconstructive techniques, new complications are being experienced, including stone formation and metabolic abnormalities. Gastrocystoplasty, although an excellent option in reconstruction, has produced a symptom complex of hematuria and dysuria in some patients, at times to a significant degree. With experience, these complications are becoming better understood and new strategies for management are being developed. On the horizon, new approaches to bladder replacement are being explored, and new investigation into the pathophysiology of pediatric bladder dysfunction is ongoing.
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PMID:Bladder reconstruction in children. 803 99

The authors describe an uncommon case of inguinal hernia with bladder and ureter content. Bladder herniation preoperative diagnosis has been achieved by means of clinical history, objective and instrumental examination (cystography). As usually happens, ureteral herniation was a chance finding; this could involve a trick in surgery setting up and doubts in the treatment methods.
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PMID:[Inguinal hernia containing bladder and ureter. A clinical case]. 820 73

Bladder psoas hitch is an surgical technique which, in very complicated cases, like repeated failures of vesico-ureteral re-implants or undiversions, allow us to bridge the shortness of the ureter and obtain a good vesico-ureteral reimplant. The surgical maneuver is described and several of the 11 cases operated by this technique are commented. The results are presented.
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PMID:[Bladder psoas hitch. Report of 11 cases]. 835 27

Bladder reconstruction using bowel segments was advanced when intermittent catheterization proved so acceptable. Access to the reservoir by way of the urethra is often not possible in children, especially boys. Implantation of the isolated appendix into the bladder remnant or colon segment similar to a ureteral reimplant provides a continence mechanism with ready catheter access (the Mitrofanoff principle). Since 1982 we have applied this principle in 41 pediatric cases of bladder reconstruction (64% boys). Primary diagnoses included bladder exstrophy (46%) and myelomeningocele (34%). Extending the concept of a flap valve continence channel with a narrow tube into the reservoir, segments of tapered ileum and ureters were also used (appendix 61%, ileum 12%, ureter 27%). Results of continence (100%) and uncomplicated catheterization (93%) have been satisfactory. Unfortunately, the longer the experience (average 3.2 years of followup), the more stone formation we experienced (32%), which is due to mucus production and bacteriuria as the stone nidus. There were 2 deaths, including 1 from a renal stone obstructing the ureter with sepsis and 1 a likely suicide. Reoperation was required for 3 stomal revisions, 2 bowel obstructions and 7 stone removals in 3 of the 6 cases in which the bladder neck was closed. Unique aspects of these reconstructions are presented, such as our current preference to bury the stoma in the umbilicus (7 cases), placement of the ureteral segment into the perineum as a neourethra and an unusual conjoined twin reconstruction.
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PMID:Appendicovesicostomy (and variations) in bladder reconstruction. 843 67

Augmentation cystoplasy using the gastrointestinal tract has disadvantages related to the intestinal resection and its incorporation into the urinary tract. To preclude both sets of complications, we performed augmentation ureterocystoplasty in a 5 1/2-year-old meningomyelocele patient with urinary incontinence, a low capacity bladder, severe vesicoureteral reflux and a poorly functioning kidney. After nephrectomy the ureter was incised longitudinally, folded over and placed onto the bladder as a patch. Bladder capacity, only 60 cc without the contribution from the refluxing upper tract, increased to 200 cc 6 months postoperatively. The patient is continent. Augmentation ureterocystoplasty is an option for bladder enlargement that obviates many of the risks associated with enterocystoplasty.
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PMID:Augmentation ureterocystoplasty. 848 20

The ureteral double pigtail stents are versatile and valued for proper urinary drainage in the setting of trauma, fistula formation, after extra-corporeal shock wave lithotripsy (ESWL) and surgical manipulations of the upper urinary tract. Also they are used for prolonged urinary drainage in patients with chronic tumor-induced ureteral obstruction, and present an exceptional patient tolerance. The authors' experience is based upon 54 patients treated for ureteral obstruction of malignant origin between January 1989 and October 1995. Complications of this method as well as the quality of life of these patients are analysed and the results compared with those of the literature. The patient tolerance was excellent. Mean survival time after ureter catheterisation was 18 months. Complete urine diversion was achieved and hydronephrosis disappeared soon after stent placement in 42 patients (80%). In addition hydronephrosis persisted in 12 cases (20%), despite orthotopic positioning of the catheter and numerous stent changes for larger caliber stents. The palliative use of the double pigtail stent when no other treatment is possible for malignant ureteral obstruction, precludes the need for ureterostomy and offers the patient a comfortable quality of life. Bladder disease is a contraindication to the use of these catheters, although their insertion is rarely impossible. In case of acute obstruction, it is better to prepare the pathway with a standard ureteral catheter, which is easier to manage. It is always possible to insert the pigtail stent after some time has elapsed.
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PMID:[Internal urinary diversion in pelvic cancers and quality of life. Value of double "J" endoprosthesis]. 876 75


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