UPJO

BACKGROUND: Ureteropelvic junction obstruction (UPJO) is a blockage occurring at the junction of the ureter and the renal pelvis. Pediatric patients with UPJO pose a diagnostic challenge when they present to the emergency department (ED) with severe recurrent abdominal pain if there is not a level of suspicion for this condition. OBJECTIVES: Our aim was to review presentation of UPJO to the ED, methods of diagnosis, and treatment of this common but often overlooked condition...

INTRODUCTION: Intermittent pelviureteric junction obstruction, and its consequence,intermittent hydronephrosis is a difficult condition to identify. The renal collecting system is not dilated between the episodes of abdominal pain attacks and a prompt investigation is hard to carry out during the time of painful crisis. Therefore, most of the patients are initially misdiagnosed. AIM: The aim of the study was to assess the occurrence and the clinical characteristics of this phenomenon in children operated in the Department of Urological Surgery, Heim Pál Children Hospital, Budapest, Hungary...

PURPOSE: In this study we evaluate the diagnostic accuracy of renal pelvic dilatation for detecting infants with prenatal hydronephrosis who will need surgical intervention for ureteropelvic junction obstruction during followup. MATERIALS AND METHODS: Between 1999 and 2010, 371 newborns diagnosed with isolated prenatal hydronephrosis were prospectively followed. The main event of interest was the need for pyeloplasty. Diagnostic odds ratio, sensitivity, specificity and diagnostic accuracy (assessed by AUC) of fetal renal pelvic dilatation and postnatal renal pelvic dilatation were evaluated...

OBJECTIVE: To present our new approach using a minimally invasive technique for the management of pelviureteral junction (PUJ) obstruction with a crossing vessel. MATERIALS AND METHODS: In December 2009 to December 2011, out of 23 cases of retroperitoneoscopic laparoscopic pyeloplasty, four adolescents presenting with PUJ obstruction due to an aberrant crossing vessel, with intermittent attacks of renal colic and mild dilatation of the renal pelvis and calyces, were operated by retroperitoneoscopic pyelopexy...

PURPOSE: We analyzed preoperative and postoperative differential renal function and characterized the renographic findings in patients with ureteropelvic junction obstruction associated with Dietl crisis. MATERIALS AND METHODS: Patients with Dietl crisis who underwent pyeloplasty between January 2004 and December 2010 were classified by renographic presentation. Patients in group 1 were diagnosed with cortical retention, those in group 2 had an initial obstructed scan (T1/2 of 20 minutes or more and no cortical retention) and those in group 3 had an initial nondiagnostic scan (T1/2 of less than 20 minutes and no cortical retention)...

OBJECTIVE: We sought to assess the clinical and imaging findings in intermittent hydronephrosis secondary to ureteropelvic junction obstruction, with particular emphasis on the characteristic ultrasonographic findings. METHODS: This prospective, longitudinal, observational study included all children who had intermittent ureteropelvic junction obstruction and presented with abdominal pain over 6 years. Renal ultrasound was used as an initial screening tool to detect intermittent hydronephrosis...

BACKGROUND: The increase in the use of prenatal ultrasound has revolutionized the detection of hydronephrosis and has had an unanticipated consequence. OBJECTIVE: To describe the new demographics of symptomatic ureteropelvic junction (UPJ) obstruction and the characteristic imaging findings, when the obstruction is extrinsic, from a crossing renal vessel. MATERIALS AND METHODS: From a uroradiology database (1994 through 1999) we identified children with surgically corrected UPJ obstruction from intrinsic and extrinsic causes...

No abstract text is available yet for this article.

Obstruction at the ureteropelvic junction (UPJ) is usually intrinsic. Recently, however, 13 (11%) of approximately 120 children with UPJ obstruction were found to have extrinsic obstruction caused by a lower-pole renal vessel. In each case, the obstruction was confirmed at the time of surgery. Most of these patients had intermittent pain. Excretory urograms did not show obstruction between episodes of pain, but when a urogram was obtained during an episode, marked obstruction was noted. Contrast agent trapped in a segment of proximal ureter suggests the presence of an extrinsic obstruction...

No abstract text is available yet for this article.

No abstract text is available yet for this article.

A case is reported of a negative pressure-flow study in a patient with intermittent hydronephrosis. This is the first known report of a properly performed pressure-flow study failing to diagnose obstruction due to the intermittent nature of the obstruction itself. This case also supports the concept that the ureteropelvic junction (UPJ) can be intrinsically normal in patients with intermittent hydronephrosis secondary to a crossing renal vessel. It also reaffirms the need to study these patients while they are symptomatic...