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Electron microscopic study of pyelointerstitial reflux scars.

H G Laberke

    Pathology, Research and Practice
    |June 1, 1987
    PubMed
    Summary
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    Is there any tubular secretion of protein?

    Clinical nephrology·1988

    Electron microscopy reveals early changes in kidney tissue with pyelointerstitial reflux damage, including thyroid-like lesions and renin granules. These findings aid in diagnosing reflux nephropathy but are not exclusive to it.

    Area of Science:

    • Nephrology
    • Pathology
    • Electron Microscopy

    Background:

    • Pyelointerstitial reflux damage can lead to significant renal pathology.
    • Established light microscopy findings are known, but electron microscopy offers further insights.

    Purpose of the Study:

    • To elucidate the detailed ultrastructural changes in renal tissue associated with pyelointerstitial reflux damage using electron microscopy.
    • To identify early pathognomonic and characteristic features of reflux nephropathy.

    Main Methods:

    • Renal tissue samples from patients with pyelointerstitial reflux damage were analyzed using electron microscopy.
    • Immunohistologic methods were employed to identify specific cellular components, such as renin granules.
    • Differentiation of thin-walled vessels was performed using electron microscopy.

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    Main Results:

    • Early stages of thyroid-like lesions were observed, characterized by isolated tubular epithelial cells and small complexes following tubular destruction.
    • Secretory granule-like structures, identified as renin granules, were detected in tubular epithelium, glomeruli, and arteriole walls.
    • Various stages of glomerular scarring and IgM deposits were documented, indicative of glomerular destruction.
    • Electron microscopy proved crucial in distinguishing between different types of thin-walled vessels.

    Conclusions:

    • Electron microscopy provides critical information beyond light microscopy for understanding pyelointerstitial reflux damage.
    • The observed findings, including thyroid-like lesions and renin granule identification, are characteristic of reflux nephropathy.
    • These ultrastructural changes are not pathognomonic and can be present in other conditions like urinary tract obstructions without reflux.