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Related Experiment Videos

Sonography of pyonephrosis: a prospective study.

B R Subramanyam, B N Raghavendra, M A Bosniak

    AJR. American Journal of Roentgenology
    |May 1, 1983
    PubMed
    Summary
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    Ultrasound effectively distinguishes hydronephrosis from pyonephrosis in patients with suspected kidney infection. This imaging technique shows high accuracy in identifying infected, fluid-filled kidney systems.

    Area of Science:

    • Radiology
    • Nephrology
    • Medical Imaging

    Background:

    • Hydronephrosis, a condition of urine backflow, can be complicated by infection (pyonephrosis).
    • Differentiating between these conditions is crucial for appropriate patient management.
    • Ultrasound is a common imaging modality for evaluating renal pelvis dilation.

    Purpose of the Study:

    • To evaluate the accuracy of sonography in differentiating hydronephrosis from pyonephrosis.
    • To determine the sensitivity and specificity of specific sonographic findings for pyonephrosis.

    Main Methods:

    • Prospective review of sonograms from 73 patients with 92 hydronephrotic kidneys.
    • Sonographic criteria for pyonephrosis included persistent internal echoes within the collecting system.

    Related Experiment Videos

  • Patients were categorized based on clinical evidence of renal infection.

    • Main Results:

    • In patients without infection, sonography showed anechoic collecting systems (100% specificity).
    • In patients with suspected infection, sonography detected internal echoes in 10 cases, correctly identifying pyonephrosis in 9 (90% sensitivity).
    • Overall accuracy in differentiating pyonephrosis from hydronephrosis in suspected cases was 96%.

    Conclusions:

    • Sonography is a highly accurate tool for differentiating pyonephrosis from hydronephrosis in patients with suspected renal infection.
    • The presence of internal echoes on ultrasound is a strong indicator of pyonephrosis.
    • Ultrasound aids in timely diagnosis and management of infected hydronephrotic kidneys.