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Related Experiment Videos

Ultrasonography in crossed renal ectopia.

S McCarthy, A T Rosenfield

    Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine
    |March 1, 1984
    PubMed
    Summary

    This study presents five cases of crossed renal ectopia, a rare congenital anomaly. Sonographic findings, including characteristic notches, help differentiate it from other conditions like renal masses or duplicated systems.

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    Area of Science:

    • Urology
    • Radiology
    • Pediatric Nephrology

    Background:

    • Crossed renal ectopia is a congenital anomaly where one or both kidneys are located on the contralateral side of the abdomen.
    • Fused and unfused variants of crossed renal ectopia present unique diagnostic challenges.

    Observation:

    • Sonographic identification of five cases of crossed renal ectopia (three fused, two unfused).
    • Bowel in the contralateral renal fossa can mimic renal masses or kidneys.
    • Crossed-fused kidneys may resemble single kidneys with duplication or renal masses.

    Findings:

    • A characteristic anterior and/or posterior notch on the kidney is a key diagnostic clue.
    • Correlation with plain radiographs and barium studies is crucial for identifying bowel in the renal fossa.
    • Real-time sonography demonstrating peristalsis aids in differentiating bowel from renal tissue.

    Implications:

    • Accurate sonographic diagnosis of crossed renal ectopia is essential to avoid misinterpretation as other renal pathologies.
    • Understanding the sonographic features and potential mimics improves diagnostic accuracy in pediatric and adult imaging.
    • Multimodality imaging correlation enhances the diagnostic confidence for this rare congenital anomaly.

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