UCTD should be differentiated from other causes of arthritis and rash such as SLE, Sjögren's syndrome, Rheumatoid arthritis
Undifferentiated connective tissue disease differential diagnosis
Malignant fibrous histiocytoma differential diagnosis
Mast cell tumor differential diagnosis
Lymphomatoid granulomatosis differential diagnosis
Fibroma differential diagnosis
Chondroma differential diagnosis
Fibromuscular dysplasia differential diagnosis
Amyloidosis differential diagnosis