anal%20fissure
ANAL FISSURE
An anal fissure is a disruption of the skin at the distal anal canal.
Most fissures are seen by separating the buttocks with opposing traction of the thumbs.
Majority of fissures are located in the posterior midline of the anus.
Acute fissures are simple splits or cracks in the anoderm while chronic fissures may show secondary changes eg sentinel tag, hypertrophied anal papilla, rolled edges, fibrosis of the edges or deep ulceration with exposure of the underlying internal anal sphincter muscle within the fissure's base.
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