FIGURE 1 Chronic anal fissure.
From the following article:
Treating chronic anal fissure with botulinum neurotoxin
Giuseppe Brisinda, Federica Cadeddu, Francesco Brandara, Donatella Brisinda and Giorgio Maria
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Figure 1. Chronic anal fissure.
(A) Drawing of anal fissure. (B) Direct observation of a chronic anal fissure, with sharp borders and exposure of fibers of the internal anal sphincter (IAS). EAS, external anal sphincter.
