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Mixed connective tissue disease in childhood. Relationship Sjögren's syndrome
Insights
Pediatric mixed connective tissue disease (MCTD) presents with overlapping autoimmune symptoms and is identified by anti-ribonucleoprotein antibodies. Early recognition and corticosteroid treatment are crucial for positive outcomes in children.
Area of Science:
- Rheumatology
- Pediatric Autoimmunology
- Clinical Immunology
Background:
- Mixed connective tissue disease (MCTD) is a distinct autoimmune disorder.
- MCTD exhibits overlapping features of systemic lupus erythematosus, scleroderma, polymyositis, and Sjögren's syndrome.
- Serological hallmark of MCTD is the presence of antibodies to ribonucleoprotein (anti-RNP).
Observation:
- This report details three pediatric cases of MCTD with high titers of anti-RNP antibodies.
- Patients presented with a combination of features including lupus erythematosus, polymyositis, scleroderma, juvenile rheumatoid arthritis, and Sjögren's syndrome.
- The complex presentation highlights the superimposed nature of connective tissue disease features in MCTD.
Findings:
- All three pediatric patients diagnosed with MCTD showed significant clinical overlap of autoimmune conditions.
- High titers of anti-ribonucleoprotein antibodies were consistently observed in these cases.
- The patients demonstrated a positive response to corticosteroid therapy.
Implications:
- The findings underscore the importance of recognizing MCTD in pediatric patients presenting with overlapping autoimmune symptoms.
- Prompt diagnosis and initiation of corticosteroid treatment can lead to adequate patient outcomes.
- Pediatricians should maintain a high index of suspicion for MCTD when encountering children with features of multiple connective tissue diseases.
Abstract:
Mixed connective tissue disease (MCTD) seems to be a distinct entity that has some manifestations of systemic lupus erythematosus, scleroderma, polymyositis, and Sjögren's syndrome and is serologically characterized by the presence of an antibody to ribonucleoprotein. We report the cases of three children with MCTD with high titers of antibody to ribonucleoprotein. Two fulfilled criteria of lupus erythematosus, two had polymyosis; all three had suggestive features of scleroderma, fulfilled criteria for the diagnosis of juvenile rheumatoid arthritis, and had Sjögren's syndrome. Additional superimposed features of another connective tissue disease should arouse suspicion of MCTD. All three of our patients responded adequately to corticosteroid treatment that makes recognition of this entity by the pediatrician all the more important.