Mixed, overlap, and undifferentiated connective tissue diseases in current rheumatology

Abstract

The diagnostic classification of systemic connective tissue diseases (CTDs) is descriptive. For classic CTDs internationally authorized classification criteria are generally used, but for CTDs outside of classic CTDs no comparable classification systems are available.

Keywords

• mixed connective tissue disease
• overlap syndromes
• undifferentiated connective tissue disease
• anti-U1RNP antibodies
• mimics of Jaccoud´s arthropathy