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Minimal change disease and IgA deposition: separate entities or common pathophysiology?
Brandon S Oberweis1, Aditya Mattoo2, Ming Wu3
1Department of Medicine, New York University, School of Medicine, New York, NY, USA.
Abstract:
Introduction. Minimal Change Disease (MCD) is the most common cause of nephrotic syndrome in children, while IgA nephropathy is the most common cause of glomerulonephritis worldwide. MCD is responsive to glucocorticoids, while the role of steroids in IgA nephropathy remains unclear. We describe a case of two distinct clinical and pathological findings, raising the question of whether MCD and IgA nephropathy are separate entities or if there is a common pathophysiology. Case Report. A 19-year old man with no medical history presented to the Emergency Department with a 20-day history of anasarca and frothy urine, BUN 68 mg/dL, Cr 2.3 mg/dL, urinalysis 3+ RBCs, 3+ protein, and urine protein : creatinine ratio 6.4. Renal biopsy revealed hypertrophic podocytes on light microscopy, podocyte foot process effacement on electron microscopy, and immunofluorescent mesangial staining for IgA. The patient was started on prednisone and exhibited dramatic improvement. Discussion. MCD typically has an overwhelming improvement with glucocorticoids, while the resolution of IgA nephropathy is rare. Our patient presented with MCD with the uncharacteristic finding of hematuria. Given the improvement with glucocorticoids, we raise the question of whether there is a shared pathophysiologic component of these two distinct clinical diseases that represents a clinical variant.
Insights
Minimal Change Disease (MCD) and IgA nephropathy may share a common pathophysiology. A case report suggests a potential clinical variant responsive to steroids.
Area of Science:
- Nephrology
- Pathology
- Pediatric Nephrology
Background:
- Minimal Change Disease (MCD) is the leading cause of nephrotic syndrome in children and typically responds to glucocorticoids.
- IgA nephropathy is the most common glomerulonephritis globally, with an unclear response to steroids.
- The potential overlap or distinction between MCD and IgA nephropathy warrants further investigation.
Purpose of the Study:
- To present a case study exploring the relationship between Minimal Change Disease and IgA nephropathy.
- To question if these distinct clinical entities share a common underlying pathophysiology.
- To investigate a potential clinical variant of these kidney diseases.
Main Methods:
- Case report of a 19-year-old male presenting with nephrotic syndrome.
- Analysis of clinical presentation including anasarca, frothy urine, elevated BUN and creatinine.
- Renal biopsy with light microscopy, electron microscopy, and immunofluorescence.
Main Results:
- Renal biopsy showed hypertrophic podocytes, podocyte foot process effacement, and mesangial IgA staining.
- The patient experienced dramatic improvement after initiating prednisone treatment.
- The patient presented with features of MCD and hematuria, responding well to glucocorticoids.
Conclusions:
- The patient's presentation and response to steroids suggest a possible shared pathophysiologic component between MCD and IgA nephropathy.
- This case highlights a potential clinical variant that challenges the traditional separation of these kidney diseases.
- Further research is needed to elucidate the commonalities and differences in the pathophysiology of MCD and IgA nephropathy.
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