Perianal abscess and fistula Quiz: Ace Your Exams
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A 64-year-old woman presents to the office with anal pain and malodorous drainage from the area for the past 2 days. The pain is worse with prolonged sitting and defecation. The patient has a history of a prior procedure to drain a perianal abscess. She has Crohn disease and takes infliximab. Temperature is 37.2 °C (99 °F), pulse is 95/min, blood pressure is 145/85 mmHg, and respirations are 15/min. Cardiopulmonary and abdominal examinations are normal. Anal examination reveals an indurated, erythematous region in the perianal area with an external opening and drainage. Anoscopy shows another erythematous opening inside the anus. Which of the following is the best diagnostic test to order at this time?
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