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Pyelonephritis is a bacterial infection that primarily affects the renal parenchyma and collecting system, including the renal pelvis, tubules, and interstitial tissue of one or both kidneys. It can be classified as either acute—a sudden, severe infection—or chronic, which refers to long-term or recurrent kidney infections.The primary cause of acute pyelonephritis (APN) is bacterial infection, with Escherichia coli accounting for approximately 70-80% of cases. Other bacteria, such...
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Nephrotic Syndrome is a chronic kidney disorder defined by clinical findings such as severe proteinuria, hypoalbuminemia, hyperlipidemia, and edema. These symptoms result from damage to the glomeruli, the kidney’s filtering units, increasing their permeability to proteins.Definition and Meaning:Proteinuria, defined as the loss of more than 3.5 grams of protein per day in adults, is a crucial feature of nephrotic syndrome. This condition is often accompanied by edema, the accumulation of...
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Introduction:For diagnosing acute pyelonephritis, a comprehensive patient history is collected to identify symptoms such as dysuria, frequent or urgent urination, flank pain, or costovertebral angle (CVA) tenderness that may suggest a kidney infection.Physical ExaminationDuring the physical examination, CVA tenderness is assessed. This involves gentle percussion over the costovertebral angle, where tenderness often indicates a kidney infection.Diagnostic TestsUrinalysis: Used to identify white...
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Acute kidney injury (AKI) causes are categorized into three primary categories based on the location of the injury: prerenal, intrarenal (or intrinsic), and postrenal causes. This classification guides clinical management and illustrates how different pathways can impair kidney function.Etiology and Pathophysiology of Acute Kidney Injury1. Prerenal causesEtiology: Prerenal Acute Kidney Injury, the most common type, occurs when reduced blood flow to the kidneys decreases filtration capacity...
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IntroductionNephrotic syndrome is a kidney disorder marked by excessive protein loss in the urine, leading to various systemic complications. This condition often results from damage to the glomeruli—the kidney's filtering units—causing proteinuria, low blood protein levels, and fluid retention. Understanding the assessment, diagnosis, and management of nephrotic syndrome is essential for effective treatment and prevention of further kidney damage.AssessmentPatient History: Document...
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Related Experiment Video

Updated: Aug 22, 2025

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Zinner's syndrome: Masquerading as pyonephrotic ectopic kidney.

Faiz Manzar Ansari1, Sajad Ahmad Para1, Shashank Singh1

  • 1Department of Urology, Sher-I-Kashmir Institute of Medical Sciences, Room No. F 05, Old SR Hostel, SKIMS, Srinagar, 190011, India.

Radiology Case Reports
|November 7, 2022
PubMed
Summary

Zinner's syndrome, a rare Wolffian duct anomaly, involves seminal vesicle cysts, kidney agenesis, and ejaculatory duct obstruction. Diagnosis relies on imaging, with cyst excision as the primary treatment for symptomatic cases.

Keywords:
CT, computed tomographyDWI, diffusion-weighted imagingEjaculatory duct obstructionFSH, follicle stimulating hormoneIpsilateral renal agenesisLH, luteinizing hormoneLUTS, lower urinary tract symptomsMRI, magnetic resonance imagingSeminal vesicle cystTURED, transurethral resection of ejaculatory ductUTI, urinary tract infectionZinner's syndrome

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Area of Science:

  • Urology
  • Developmental Biology
  • Medical Imaging

Background:

  • Zinner's syndrome is a rare congenital anomaly originating from the Wolffian duct.
  • It is characterized by a specific triad: seminal vesicle cyst, ipsilateral renal agenesis, and ejaculatory duct obstruction.
  • First described in 1914, the syndrome can present with associated renal abnormalities like dysplasia or ectopic ureteric orifices.

Observation:

  • Patients typically manifest symptoms between the second and fourth decades of life.
  • Common symptoms include urinary bladder irritation or obstruction, cyst distension, and ejaculatory duct obstruction.
  • Diagnosis is primarily achieved through imaging studies, with Magnetic Resonance Imaging (MRI) often used for confirmation.

Findings:

  • The core finding is the co-occurrence of seminal vesicle cyst, ipsilateral renal agenesis, and ejaculatory duct obstruction.
  • Aberrant presentations may include renal dysplasia and ectopic ureteric orifices within Wolffian duct derivatives.
  • Clinical presentation varies, with symptoms related to urinary tract obstruction and cyst enlargement.

Implications:

  • Early and accurate diagnosis via imaging is crucial for effective management.
  • Treatment strategies are guided by the presence of persistent symptoms or complications.
  • Surgical excision of the seminal vesicle cyst is considered the gold standard for managing Zinner's syndrome.