A 29-year-old man is found to have an anal fissure located at the 3 o'clock position on examination. There is no history of constipation. What is the most important implication of this finding?
- A It confirms chronicity and mandates immediate lateral internal sphincterotomy
- B It suggests an underlying cause such as Crohn's disease, HIV or tuberculosis and needs biopsy and further evaluation ✓
- C It indicates a hypertrophied puborectalis and responds best to botulinum toxin injection
- D It represents a healed fissure requiring no investigation
Correct answer: B. It suggests an underlying cause such as Crohn's disease, HIV or tuberculosis and needs biopsy and further evaluation
Explanation
Idiopathic anal fissures occur almost exclusively in the posterior midline, with about 10 percent anterior, particularly in women. A fissure away from the midline, especially multiple or lateral, strongly suggests secondary causes: Crohn's disease, HIV infection, tuberculosis, syphilis or anal carcinoma. Such fissures require biopsy, cultures and systemic workup rather than sphincterotomy, since treating the underlying disease is essential and dividing sphincter muscle in Crohn's disease risks non-healing wounds and incontinence.
Reference: Bailey and Love's Short Practice of Surgery, 27th ed.
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Written and medically reviewed by the StethoPrep medical team.