MR urography using HASTE imaging in the assessment of ureteric obstruction.

Regan, Fintan; Bohlman, Mark E.; Khazan, Ron; Rodríguez, Ronald; Schultze-Haakh, Helmuth

doi:10.2214/ajr.167.5.8911161

Cited by 160 publications

(86 citation statements)

References 12 publications

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“…[9,5] The major drawback of MRU is its low sensitivity in detecting non-obstructive or small obstructing calculi and parenchymal stones so there is still significant false negative rate, even though people has proposed some new techniques. [7,8,4] MRU's other drawbacks are its relatively low accessibility and higher cost. We have not been able to define the best technique for MRU in diagnosing urinary tract calculi yet.…”

Section: Discussionmentioning

confidence: 99%

“…[5,2,3,6,7,8,4] 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. Static-fluid MR urography makes use of heavily T2-weighted sequences to image the urinary tract as a static collection of fluid, can be repeated sequentially (cine MR urography) to better demonstrate the ureters in their entirety and to confirm the presence of fixed stenosis, and is most successful in patients with dilated or obstructed collecting systems.…”

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confidence: 99%

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MR Urography With Dynamic 3d Mip Aided Detection- Diagnostic Significance Value in Suspected Pelvicaliectasis Confirmation

Ameen¹,

Vetriraj²

2018

jemds

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BACKGROUND Hydronephrosis is the most common cause of chronic renal failure. Hydronephrosis due to calculus disease is more frequent than without non-calculus aetiology. Mild hydronephrosis or mild pelvicaliectasis is commonly encountered on routine ultrasound screening. Radiologist's bias in mild pelvicaliectasis as to rule out physiological or early pathology is our purpose of study. Role of MR Urography serve as a problem solving tool for ultrasound in mild pelvicaliectasis by specific protocol with 3D aided and dynamic imaging.The objective of this study is to evaluate efficacy of MR urography for suspecting hydronephrosis in asymptomatic and incidental detected hydronephrosis in other radiological modalities. MATERIALS AND METHODS34 patients were enrolled in descriptive study with institutional ethical review obtained. Clinically suspected pelvicaliectasis patients screened by Ultrasound were set as inclusion criteria. Pelvicaliectasis positive patients on ultrasound were subjected to MR urography and renal diuretic nuclear study. Remaining patients were set as control group and compared with the results. MR urography non-contrast protocol were deployed. The three dimensional sequence was used to track passage of contrast from kidneys to ureter and bladder. MR urography followed by furosemide scintigraphy was also done to compare the efficacy of MR urography, keeping as reference standard. Nuclear medicine furosemide renal study was done for all MR urography within 1 week duration. Renal functional test parameters like renal transit time and average contrast wash-out time are calculated, and in all the cases these parameters are depicted as characteristics of analysis curve. Bland-Altman plots were used to quantify intra-and interobserver performance. Statistical significance was derived by comparing both modality curves with a mean under the curve of 0.90. Percentage analysis was also done by comparing two modalities, sensitivity and specificity. RESULTS6 positive cases were noted from MR Urography from sample size (N= 19) with left UPJ obstruction (N= 1), right VUJ obstruction (N= 1), stricture in right mid ureter (n= 3) and left mid ureter (N= 1). Calculus obstruction patients were excluded from the study. All the cases and results were compared with diuretic renal scintigraphy. On the basis of interobserver performance on characteristic curves, results obtained were almost similar. RTT obstructed (RTT > 410 seconds) obtained from both characteristic curves with percentage analysis were with better sensitivity (98.8%) and specificity (100%). CONCLUSIONMR Urography proved to be the future gold standard for suspected mild pelvicaliectasis in our study. However, large cohort study needs to be addressed to prove efficacy in large sample volume.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

MR Urography With Dynamic 3d Mip Aided Detection- Diagnostic Significance Value in Suspected Pelvicaliectasis Confirmation

Ameen¹,

Vetriraj²

2018

jemds

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“…Estudios previos registran una sensibilidad en el diagnóstico de obstrucción del tracto urinario de la urografía por RM del 100%, tal es el caso de Louca et al 19 , Hussain et al 20 , O'Malley et al 21 y Regan et al 22, si bien discrepan en la capacidad de esta exploración en la detección de la patología de base. Este diagnóstico se consigue en la mitad de los pacientes de Louca y Hussain; O'Malley et al presentan una sensibilidad en el diagnóstico etiológico del 90% y Regan et al del 100%.…”

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Uso de la urografía por resonancia magnética en el estudio del aparato urinario frente a la urografía convencional

et al. 2007

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RESUMENUSO DE LA UROGRAFÍA POR RESONANCIA MAGNÉTICA EN EL ESTUDIO DEL APARATO URINARIO FRENTE A LA UROGRAFÍA CONVENCIONAL La urografía convencional (UIV) es una exploración fundamental en la valoración del aparato urinario no exenta de morbilidad, como reacciones adversas al contraste (vasovagales y anafilácticas), neurotoxicidad, nefrotoxicidad, así como la irradiación ionizante a la que somete al paciente. Por este motivo se desarrollan técnicas de imagen alternativas como la urografía por resonancia magnética (RM) o urorresonancia.Objetivos: Presentamos un estudio que valora la precisión diagnóstica, especificidad y sensibilidad de la urorresonancia y de la UIV como exploración morfológica y funcional del aparato urinario; así como de la calidad de las imágenes urográficas obtenidas con la RM frente a la UIV.Material y métodos: 150 pacientes han sido sometidos a un estudio de RM, en 63 de ellos se realizó también estudio urográfico convencional, con apreciación de señales de alta intensidad en T2 correspondientes al fluido abdominal y retroperitoneal, empleando previamente furosemida a bajas dosis, y en un estudio final, administrando gadolinio a razón de 0,1 mg./Kg. La prueba fue indicada en pacientes con antecedentes de reacciones adversas al contraste yodado, fracaso renal agudo o crónico, anulación funcional renal, pacientes embarazadas y en edad infantil así como cuando la UIV no fue diagnóstica. Se estudió la capacidad de ambas pruebas para el diagnóstico de obstrucción urinaria y de la etiología de esta. También se evalúo la calidad de las imágenes que ofrece el estudio urográfico con RM.Resultados: Se obtuvieron imágenes de alta resolución con la RM de toda la vía urinaria superior, especialmente de pelvis renal, no artefactadas por la peristalsis o la interposición del fluido intestinal. En el 83,3% de los casos la exploración reveló patología urológica. La precisión diagnóstica de la causa de afectación del aparato urinario fue de un 83,3%, con una sensibilidad del 89,6%, una especificidad del 69,2%, valor predictivo positivo del 86,6% y valor predictivo negativo del 75%.Conclusión: La urografía por RM es una técnica con una elevada sensibilidad para el estudio del aparato urinario, que puede ser empleada como alternativa a la urografía convencional especialmente en los casos de contraindicación de la radiación ionizante, alergia al contraste, así como en pacientes con fracaso renal, pero que ofrece un estudio morfológico y funcional más amplio, con elevada calidad de imágenes, pudiendo desplazar a los estudios convencionales en un plazo corto o medio de tiempo.Palabras clave: Urorresonancia. Urografía intravenosa. Tracto urinario. ABSTRACT USE OF UROGRAPHY BY MAGNETIC RESONANCE FOR THE STUDY OF THE URINARY APPARATUS VERSUSCONVENTIONAL UROGRAPHY Conventional urography (IVU) is an essential examination for the assessment of urinary tract but it is not free of complications, such as adverse reactions to contrast agents used (vasovagal and anaphylactic reactions), neurotoxicity, nephrotoxicity, as well...

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“…Intravenous Urography (IVU) has been the initial imaging technique of choice for diagnosis of various urological disorders, ever since it was first performed in 1923 at Mayo Clinic by Osborne et al [1][2][3][4][5] However, it has limitations related to low spatial resolution, radiation exposure and toxicity & allergy related to contrast .…”

Section: Introductionmentioning

confidence: 99%

“…Computed Axial Tomography (CT), though the current gold standard in diagnosing urolithiasis, is fraught with the drawbacks of radiation exposure and contrast toxicity. [2][3][4] Magnetic Resonance Urography (MRU), introduced by Hennig et al in 1986, is emerging as a safe alternative. [11&12] In this technique MRI technology is used to create high resolution heavily-T 2 weighted coronal images of the urinary tract that resemble a traditional IVU without the use of contrast agents or ionizing radiation.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Resonance Urography in Patients with NonContributory Intravenous Urography

Singhal¹

2017

IOSR JDMS

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MR urography using HASTE imaging in the assessment of ureteric obstruction.

Abstract: HASTE MR urography accurately and rapidly shows the level and degree of ureteric obstruction. It can be used to differentiate between acute and chronic obstruction on the basis of its ability to show perirenal fluid.

Cited by 160 publications

References 12 publications

MR Urography With Dynamic 3d Mip Aided Detection- Diagnostic Significance Value in Suspected Pelvicaliectasis Confirmation

MR Urography With Dynamic 3d Mip Aided Detection- Diagnostic Significance Value in Suspected Pelvicaliectasis Confirmation

Uso de la urografía por resonancia magnética en el estudio del aparato urinario frente a la urografía convencional

Magnetic Resonance Urography in Patients with NonContributory Intravenous Urography

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