[MCTD (Sharp) syndrome in childhood (author's transl)]

Area of Science:

• Pediatric Rheumatology
• Immunology
• Pathology

Background:

• Mixed Connective Tissue Disease (MCTD) is an autoimmune disorder with overlapping features of other connective tissue diseases.
• The long-term prognosis and clinical course, especially in children, require further elucidation.
• Previous assumptions of a generally favorable prognosis based on the absence of specific organ involvement need re-evaluation.

Observation:

• Six pediatric cases of MCTD were analyzed and compared with existing literature.
• Immunological and histological findings suggest MCTD may be a distinct entity or a specific presentation of other connective tissue diseases.
• Two patients presented with severe conditions: membrano-proliferative glomerulonephritis and myo-pericarditis.

Findings:

• The initial belief that MCTD has a favorable course, particularly without kidney or central nervous system (CNS) involvement, is challenged by recent observations.
• Severe outcomes, including fatalities, have been reported in childhood MCTD cases, necessitating a revised understanding of the disease's potential severity.
• The presence of severe membrano-proliferative glomerulonephritis and myo-pericarditis in studied patients highlights the potential for significant organ damage.

Implications:

• The clinical course of childhood MCTD may be more severe than previously recognized, demanding vigilant monitoring and proactive management.
• Re-evaluation of diagnostic criteria and prognostic indicators for pediatric MCTD is crucial.
• Further research is needed to understand the long-term outcomes and optimal treatment strategies for children with MCTD.