Anorectal Conditions: External Hemorrhoids and Anal Polyps
Definition and Characteristics
- External hemorrhoids are vascular structures located below the dentate line in the anal canal, becoming symptomatic primarily when thrombosed or when skin tags become large enough to interfere with proper hygiene 1, 2
- The American Gastroenterological Association notes that anal polyps are benign growths of tissue that project from the mucous membrane of the anal canal, distinct from hemorrhoids in their origin and structure 3
Clinical Presentation
- External hemorrhoids typically present with acute onset of anal pain and a visible, palpable perianal lump when thrombosed, with pain being the predominant symptom due to rich somatic innervation 1
- Anal polyps are usually painless unless they become irritated or infected, and may be pedunculated or sessile 4
Diagnostic Approach
- External examination and anoscopy with adequate light source are essential for proper evaluation of both conditions, with the presence of pain strongly suggesting external hemorrhoids rather than anal polyps 1, 3
- If there is concern for inflammatory bowel disease or cancer, colonoscopy may be indicated, and imaging studies are only recommended if there is suspicion of concomitant anorectal diseases 4
Management Considerations
- External hemorrhoids require treatment only when symptomatic, with thrombosed external hemorrhoids presenting within 72 hours benefiting from excision under local anesthesia 2
- Anal polyps may require biopsy to rule out neoplastic growth, and up to 20% of patients with hemorrhoids have concomitant anal fissures, which can complicate diagnosis 4, 1
Common Pitfalls
- Mistaking other painful anorectal conditions for external hemorrhoids, and attributing symptoms to hemorrhoids without adequate examination are common pitfalls 2, 3
- Failing to recognize that new-onset anal pain without a visible source may indicate a small intersphincteric abscess, and not considering that multiple anorectal conditions can present similarly 1, 4