© Cambridge University Press 2015. A 50-year-old woman sustained an injury to her right wrist after a computer fell on it. A few weeks later she had pain and swelling in her right wrist. All wrist movements were painful. Due to the possibility of tendon injury, a plastic surgeon operated on her wrist and found no abnormalities. After surgery, her hand was swollen and pain worsened. It was mostly aching and burning, but sometimes sharp in nature. Gradually, she was unable to use her right hand due to pain, swelling, discomfort, tightness, and weakness. Gradually, she started to notice that the right hand felt colder and looked paler than the other hand. She had poor nail growth and the skin on her affected hand became dry. She was crippled in her personal and occupational life due to the above condition. 1. What are the differential diagnoses in this case? Cellulitis Lymphedema Soft tissue or bone injury, including occult or stress fracture Compartment syndrome Arthritis or arthrosis Tenosynovitis Upper or lower limb venous thrombosis Arterial insufficiency such as thromboangiitis obliterans or severe atherosclerosis Scleroderma Plexitis, peripheral neuropathy Erythromelalgia.