is ankylosing spondylitis a connective tissue disease?
Connective Tissue Disorders Specific entities include rheumatoid arthritis (RA), systemic sclerosis (SSc), dermatomyositis/polymyositis (DM/PM), mixed connective tissue disease (MCTD), systemic lupus erythematosus (SLE), Sjögren's syndrome (SS), relapsing polychondritis, and ankylosing spondylitis.