What are commonly observed abnormalities in anal fissure?

Updated: Jul 24, 2020
  • Author: Lisa Susan Poritz, MD; Chief Editor: John Geibel, MD, MSc, DSc, AGAF  more...
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The most commonly observed abnormalities are hypertonicity [2] and hypertrophy of the internal anal sphincter, leading to elevated anal canal and sphincter resting pressures. The internal sphincter maintains the resting pressure of the anal canal; anal-rectal manometry can be used to measure this pressure. Most patients with anal fissures have an elevated resting pressure, which returns to normal levels after surgical sphincterotomy.

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