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Glomerulonephritis in children with mixed connective tissue disease
S Ito1, T Nakamura, R Kurosawa
1Department of Pediatrics, Yokohama City University Medical Center, Urafunecho 4-57, Minamiku, Yokohama, Kanagawa, 232-0024 Japan. hi5-si@urahp.yokohama-cu.ac.jp
Clinical Nephrology
|September 26, 2006
Summary
Children with mixed connective tissue disease (MCTD) often have silent kidney disease. Early renal biopsy and monitoring hypocomplementemia are crucial for diagnosing nephritis in juvenile MCTD.
Area of Science:
- Pediatric Rheumatology
- Nephrology
- Immunology
Background:
- Mixed connective tissue disease (MCTD) shares features with systemic lupus erythematosus (SLE).
- Juvenile MCTD carries a higher risk of nephritis than adult MCTD.
- The necessity of renal biopsy and the role of hypocomplementemia in juvenile MCTD nephritis remain unclear.
Purpose of the Study:
- To investigate the histopathological features of nephritis in juvenile MCTD.
- To assess the diagnostic value of renal biopsy in children with MCTD.
- To analyze the implications of hypocomplementemia in MCTD-associated nephropathy.
Main Methods:
- Renal biopsy was performed on 11 children with MCTD.
- A review of 71 juvenile MCTD cases (including the 11 patients) was conducted to determine nephritis frequency.
- Hypocomplementemia and pathological findings were analyzed in 41 MCTD nephritis cases.
Main Results:
- Glomerulonephritis was found in 6 of 11 biopsied children, with four showing no urinalysis abnormalities.
- Approximately 28% of juvenile MCTD cases presented with latent nephritis.
- Membranous nephropathy (MN) and mesangial proliferative glomerulonephritis (MPG) were common; hypocomplementemia was linked to MN and mixed MPG/MN forms.
Conclusions:
- Renal biopsy is recommended for children with MCTD due to a high incidence of asymptomatic nephritis.
- Hypocomplementemia in MCTD patients indicates a significant likelihood of glomerulonephritis, including membranous lesions.
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