Question of the Week

A 35-year-old woman presents with pain in her fingers and nose tip that started a few minutes ago. Her fingers turned blue, followed by redness. Both hands were involved symmetrically. Her history is significant for scleroderma diagnosed a few years ago. A physical examination shows erythema of fingers in both hands. What is the most appropriate investigation to diagnose her condition? Ultrasonography Dermatoscopy Angiography Fluoroscopy