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Related Experiment Videos

Medullary rays. Visualization during excretory urography.

L R Bigongiari, S K Patel, H Appelman

    The American Journal of Roentgenology, Radium Therapy, and Nuclear Medicine
    |December 1, 1975
    PubMed
    Summary
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    Medullary rays, visualized during excretory urography in states of tubular stasis, represent bundles of renal tubules. Their appearance indicates hyperconcentration of contrast material within these structures.

    Area of Science:

    • Nephrology
    • Radiology
    • Human Anatomy

    Background:

    • Medullary rays are distinct anatomic structures composed of renal tubules.
    • These structures extend from the renal cortex through the renal medulla as medullary striations.
    • They are not typically visualized during standard excretory urography.

    Purpose of the Study:

    • To describe the visualization of medullary rays during excretory urography.
    • To correlate the radiographic appearance with underlying renal physiology.
    • To understand the role of tubular stasis in contrast material visualization.

    Main Methods:

    • Review of cases where medullary rays were visualized during excretory urography.
    • Correlation of imaging findings with known physiology of tubular stasis and contrast material handling.

    Related Experiment Videos

  • Comparison with microradiographic studies of normal and obstructed kidneys.
  • Analysis of retrograde injection studies of medullary rays.

    • Main Results:

    • Medullary rays are visualized as fine striations during excretory urography in abnormal states.
    • Visualization occurs in conditions of tubular stasis and hyperconcentration of contrast material.
    • Contrast material is hyperconcentrated within renal tubules during tubular stasis.
    • Microradiography shows highest contrast concentration in collecting ducts.
    • Retrograde injection into medullary rays produces similar radiographic images.

    Conclusions:

    • The visualization of medullary rays on excretory urography is indicative of specific pathophysiologic states.
    • Tubular stasis and hyperconcentration of contrast material are key factors in their radiographic appearance.
    • Understanding medullary ray visualization aids in interpreting urographic findings in certain renal conditions.