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Mesangial IgA nephropathy and idiopathic nephrotic syndrome
M Rambausek1, R Waldherr, W Rauterberg
1Department of Internal Medicine, Pathology and Immunology, University of Heidelberg, FRG.
Abstract:
A 17-year-old male presented with nephrotic syndrome associated with microscopic hematuria. Renal biopsy showed only minor glomerular abnormalities (light microscopy). Immunohistology demonstrated strong mesangial deposition of IgA. Electronmicroscopy disclosed widespread effacement of foot processes in combination with isolated osmiophilic mesangial deposits. The patient responded to standard corticosteroid therapy with complete disappearance of proteinuria. Microscopic hematuria, however, persisted. Five months after steroid therapy was stopped, the nephrotic syndrome relapsed. It was again steroid-responsive with persisting microhematuria. From clinical and morphological data we conclude that the patient has concomitant idiopathic nephrotic syndrome (minimal change glomerulonephritis) and mesangial IgA glomerulonephritis. The simultaneous presence of these two diseases may give some hint as to their pathogenesis. In both, abnormalities in T cell regulation have been found. If these were indeed involved in the pathogenesis of the two glomerular diseases, a higher than expected probability for the two entities to coexist in the same patient is to be expected.
Insights
This study reports a rare case of a teen with nephrotic syndrome and IgA glomerulonephritis, both responding to steroids but with persistent hematuria. The co-occurrence suggests potential shared T-cell regulatory pathways in these kidney diseases.
Area of Science:
- Nephrology
- Immunology
- Pathology
Background:
- Nephrotic syndrome, often linked to minimal change glomerulonephritis, presents with proteinuria and edema.
- IgA nephropathy is characterized by IgA deposits in the kidney mesangium, potentially causing hematuria and impaired kidney function.
Observation:
- A 17-year-old male exhibited nephrotic syndrome with microscopic hematuria.
- Renal biopsy revealed minimal glomerular changes on light microscopy, but immunohistology showed IgA deposition, and electron microscopy identified foot process effacement and mesangial deposits.
Findings:
- The patient responded to corticosteroids with resolution of proteinuria, but microscopic hematuria persisted.
- Relapse of nephrotic syndrome occurred after steroid cessation, again with steroid responsiveness and persistent hematuria.
- Clinical and morphological data suggest a concomitant diagnosis of idiopathic nephrotic syndrome (minimal change glomerulonephritis) and mesangial IgA glomerulonephritis.
Implications:
- The co-occurrence of minimal change glomerulonephritis and IgA glomerulonephritis in the same patient is uncommon.
- Shared potential pathogenetic mechanisms involving T-cell dysregulation may explain the simultaneous presence of these distinct glomerular diseases.
- This case highlights the importance of comprehensive renal evaluation for complex presentations of kidney disease.