An 81-year-old man with hypertension presented with pain and swelling of the left thigh and lower leg that had developed during the previous several hours. He had no history of recent surgery or trauma and no known personal or family history of clotting disorders. The left lower leg was tender, cold, and swollen, and the dorsalis pedis pulse was not palpable.
What is the diagnosis?
A) Polycythemia vera
B) Generalized essential telangiectasia
C) Phlegmasia cerulea dolens
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