What is undifferentiated connective tissue disease?

Type not clear: Undifferentiated connective-tissue disease (uctd) is a diagnosis applied to signs and symptoms that are consistent with a connective-tissue disease (ctd) but that do not fulfill the classification or diagnostic criteria for any one of the defined ctds such as (rheumatoid arthritis, lupus, etc..).

Combination: Combination of symptoms shared by multiple connective tissue diseases (e.g., lupus, scleroderma, polymyositis), but insufficient to categorize it as a specific one.