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Idiopathic membranous glomerulopathy in Canadian children: a clinicopathologic study
Abstract:
The 1,205 renal biopsies performed at The Hospital for Sick Children, Toronto, were reviewed to identify membranous glomerulopathy. Fourteen patients had a clinicopathologic diagnosis of idiopathic membranous glomerulopathy. Typical thickening of glomerular capillary basement membranes, a spike-and-dome pattern, and subepithelial electron-dense deposits were noted. Strong deposits of IgG and weaker deposits of C3, IgM, and IgA were present in glomeruli. Stages of membranous glomerulopathy on electron microscopy were I in one biopsy, II in nine biopsies, and III in four biopsies. Two additional biopsies from one child initially showed minimal lesion-type disease; later, a third showed membranous glomerulopathy. At presentation 11 patients had nephrotic syndrome, seven had hypertension, and eight had hematuria. Now four are in remission, seven have active disease with normal renal function, and three have renal failure. Patients with hypertension tended to do worse than those without. Age at onset, presence of nephrotic syndrome or hematuria, and administration of steroids or immunosuppressive drugs did not adversely affect outcome. Furthermore, clinical outcome did not correlate with stage of disease. Hence pathologic and most clinical features do not predict long-term prognosis in children with membranous glomerulopathy.
Insights
Idiopathic membranous glomerulopathy in children often presents with nephrotic syndrome, hematuria, or hypertension. However, pathological and clinical features, including disease stage, do not reliably predict long-term renal outcomes.
Area of Science:
- Nephrology
- Pediatric Nephrology
- Pathology
Background:
- Membranous glomerulopathy (MG) is a significant cause of nephrotic syndrome in children.
- Idiopathic MG accounts for a substantial portion of pediatric MG cases.
- Understanding prognostic factors is crucial for managing pediatric kidney disease.
Purpose of the Study:
- To review the clinicopathologic features of idiopathic membranous glomerulopathy in children.
- To evaluate the correlation between pathological findings, clinical presentation, and long-term renal outcomes.
- To identify predictors of prognosis in pediatric idiopathic MG.
Main Methods:
- Retrospective review of 1,205 renal biopsies to identify cases of idiopathic membranous glomerulopathy.
- Analysis of clinical data including presentation (nephrotic syndrome, hypertension, hematuria) and outcomes (remission, active disease, renal failure).
- Correlation of electron microscopy findings (disease stage) with clinical course and prognosis.
Main Results:
- Fourteen pediatric patients were diagnosed with idiopathic membranous glomerulopathy.
- Common findings included glomerular capillary basement membrane thickening, spike-and-dome pattern, and subepithelial IgG deposits.
- At presentation, nephrotic syndrome, hypertension, and hematuria were frequent. Long-term outcomes varied, with some achieving remission and others progressing to renal failure.
- Hypertension at presentation was associated with a worse outcome.
- Importantly, disease stage, age at onset, presenting symptoms, and immunosuppressive therapy did not significantly correlate with long-term prognosis.
Conclusions:
- Pathological features and most clinical characteristics at presentation do not reliably predict the long-term prognosis of idiopathic membranous glomerulopathy in children.
- Further research may be needed to identify more accurate prognostic markers in this population.
- The heterogeneity of outcomes underscores the complexity of managing pediatric membranous glomerulopathy.