Isolated Raynaud's phenomenon--a benign disorder.

Ninety-seven patients presenting with isolated Raynaud's phenomenon were evaluated clinically and immunologically. Three patients developed progressive systemic sclerosis in a 3-5-year follow-up. Nineteen patients had positive antinuclear antibody, 32 depressed serum complement, and 31 elevated serum immune complexes. None of the immunologic abnormalities had obvious diagnostic significance.