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EM@3AM: Pyogenic Flexor Tenosynovitis

A 40-year-old female presents to your Emergency Department with three days of pain and swelling in her right index finger. On exam, her right index finger is diffusely swollen, erythematous, and held in flexion. There is a punctate wound on the dorsal finger distal to the  DIP. She has significant tenderness to palpation of the flexor compartment of the finger and pain on extension. What is your next step in evaluation and treatment?