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Chapter 33. Anorectum
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All of the following are sites of perirectal fistulas, except
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The correct answer is D. Infralevator
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Anal bleeding can be commonly caused by
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C. Anorectal abscess (undrained)
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E. Thrombosed external hemorrhoids
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The correct answer is D. Anal fissure
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A. Can be distinguished from prolapsed hemorrhoids based on exam showing concentric folds of the mucosa
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B. Is more common in males
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C. Cannot involve the muscular layers of the rectum due to fixation to the pelvic sidewalls
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D. Is best evaluated by magnetic resonance imaging
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E. Is more common in men than women
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The correct answer is A. Can be distinguished from prolapsed hemorrhoids based on exam showing concentric folds of the mucosa
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Squamous cell tumors of the anal canal
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A. Are typically treated with a regimen of chemotherapy and radiation therapy after diagnosis
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B. Are about as common as rectal cancers
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C. Have a 25% response rate to initial therapy regimens
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D. Typically require abdominoperineal resection for complete treatment
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E. Rarely metastasize to regional lymph nodes
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The correct answer is A. Are typically treated with a regimen of chemotherapy and radiation therapy after diagnosis
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A. Are unlikely to recur after treatment
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B. Are often treated with antiviral therapy as first-line treatment
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C. Can be managed by palliation of macroscopic lesions by operation
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D. Do not carry any risk of dysplasia
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E. Are always asymptomatic
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The correct answer is C. Can be ...