Anorectal abscess: Difference between revisions
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==Background==
==Background==
*Usually begin via blocked anal gland (leads to infection/abscess formation)
 
[[File:Abscess diag 02.png|thumb|Anorectal abscess types and their locations.]]
*Usually begin via blocked anal gland (leads to infection/[[Special:MyLanguage/abscess|abscess]] formation)
**Can progress to involve any of the potential spaces.
**Can progress to involve any of the potential spaces.
===Perianal===
*Most common
*Located close to anal verge, posterior midline, superficial tender mass
===Ischiorectal===
*2nd most common
*Larger, indurated, well-circumscribed, located laterally on medial aspect of buttocks
===Intersphincteric, deep postanal, pelvirectal===
*Rectal pain, skin signs may not be present
*Constitutional symptoms often present


==Risk Factors==
{| {{table}}
*Crohn’s disease
| align="center" style="background:#f0f0f0;"|''' '''
*Chronic constipation
| align="center" style="background:#f0f0f0;"|'''Perianal'''
*Diabetes mellitus
| align="center" style="background:#f0f0f0;"|'''Ischiorectal'''
*Chronic corticosteroid use
| align="center" style="background:#f0f0f0;"|'''Intersphincteric, deep postanal, pelvirectal'''
|-
| '''Epidemiology'''||Most common||Second most common||Least common
|-
| '''Symptoms'''||Located close to anal verge, posterior midline, superficial tender mass||Larger, indurated, well-circumscribed, located laterally on medial aspect of buttocks||Rectal pain, skin signs may not be present
|-
| '''Comments'''||High incidence of [[Special:MyLanguage/anal fistula|fistula]] formation even with drainage||||Constitutional symptoms often present
|}
 
 
===Risk Factors===
 
*[[Special:MyLanguage/Crohn's disease|Crohn's disease]]
*Chronic [[Special:MyLanguage/constipation|constipation]]
*[[Special:MyLanguage/Diabetes mellitus|Diabetes mellitus]]
*Chronic [[Special:MyLanguage/corticosteroid|corticosteroid]] use
 


==Clinical Features==
==Clinical Features==
[[File:Perianalabscess.jpg|thumb|Perianal abscess.]]
[[File:Perianalabszess 01.jpg|thumb|Perianal abscess.]]
*Worsening pain around bowel movement, with decreased pain post rectal evacuation
*Worsening pain around bowel movement, with decreased pain post rectal evacuation
*Perirectal abscesses often accompanied by fever, leukocytosis
*Perirectal abscesses often accompanied by [[Special:MyLanguage/fever|fever]], [[Special:MyLanguage/leukocytosis|leukocytosis]]
**May only be paplpated via digital rectal exam
**May only be palpable via digital rectal exam
*Tender inguinal adenopathy may be only clue to deeper abscesses
**Perianal abscesses typically do not cause fever in immunocompetent individuals
*Tender inguinal [[Special:MyLanguage/lymphadenopathy|lymphadenopathy]] may be only clue to deeper abscesses


==Diagnosis==
*CT or US can be useful to define deep abscesses (esp w/ pain out of proportion to exam)


==Differential Diagnosis==
==Differential Diagnosis==
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{{Anorectal DDX}}
{{Anorectal DDX}}
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</translate>
{{SSTI DDX}}
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==Treatment==
 
*All perirectal abscesses should be drained in the OR
==Evaluation==
*Common bacteria: Staphylococcus aureus, Escherichia coli, Streptococcus, Proteus and Bacteroides
 
*Isolated perianal abscess is only type of anorectal abscess that should be treated in ED
*CT with IV contrast can be useful to define deep abscesses (especially with pain out of proportion to exam)
**Consider either linear incision w/ packing or cruciate incision w/o packing
*May consider [[Special:MyLanguage/ultrasound|ultrasound]] or MRI as alternatives
 
 
==Management==
 
*Isolated perianal [[Special:MyLanguage/abscess|abscess]] is only type of anorectal [[Special:MyLanguage/abscess|abscess]] that should be treated in ED
**Consider either linear incision with packing, elliptical incision, or cruciate incision without packing
**Frequent sitz baths
**Frequent sitz baths
*All perirectal abscesses (ischiorectal, intersphincteric, supralevator) should be drained in the OR
*All anorectal abscesses require surgical referral and follow up
===Antibiotics===
===Antibiotics===
Causative organisms: Mixed infection with fecal flora for anaerobes and Gram Negatives ([[Bacteroides fragilis]]and  [[Escherichia coli]])


'''Only indicated for:'''<ref>BMJ Best Practice Anorectal abscess http://bestpractice.bmj.com/best-practice/monograph/644/treatment/step-by-step.html</ref><ref>Guidelines.gov - Practice parameters for the management of perianal abscess and fistula-in-ano.http://www.guideline.gov/content.aspx?id=36077</ref>
''Causative organisms: Mixed infection with fecal flora for [[Special:MyLanguage/anaerobes|anaerobes]] and [[Special:MyLanguage/Gram Negatives|Gram Negatives]] ([[Special:MyLanguage/Bacteroides fragilis|Bacteroides fragilis]] and  [[Special:MyLanguage/Escherichia coli|Escherichia coli]])''
*Elderly
 
*Systemic signs (fever, leukocytosis)
'''Use is controversial'''
*Valvular heart disease
*Only recommended in high risk patients:<ref>BMJ Best Practice Anorectal [[Special:MyLanguage/abscess|abscess]] http://bestpractice.bmj.com/best-practice/monograph/644/treatment/step-by-step.html</ref><ref>Guidelines.gov - Practice parameters for the management of perianal [[Special:MyLanguage/abscess|abscess]] and fistula-in-ano.http://www.guideline.gov/content.aspx?id=36077</ref>
*Cellulitis
**Elderly
*Immunosuppression
**Diabetics
**Systemic signs ([[Special:MyLanguage/fever|fever]], [[Special:MyLanguage/leukocytosis|leukocytosis]])
**[[Special:MyLanguage/Valvular heart disease|Valvular heart disease]]
**[[Special:MyLanguage/Cellulitis|Cellulitis]]
**Immunosuppression
*Possibly prevent [[Special:MyLanguage/anal fistula|fistula]] formation in otherwise healthy patients<ref>Mocanu V, Dang JT, Ladak F, et al. Antibiotic use in prevention of anal fistulas following incision and drainage of anorectal abscesses: A systematic review and meta-analysis. Am J Surg. 2019;217(5):910-917.</ref>
 
'''Treatment options:'''
*[[Special:MyLanguage/Augmentin|Augmentin]]
*[[Special:MyLanguage/Ciprofloxacin|Ciprofloxacin]] 500mg PO BID '''and''' [[Special:MyLanguage/Metronidazole|Metronidazole]] 500mg PO TID
 
 
==Disposition==
 
 
===Discharge===
 
*Perianal abscess


Treatment options:
*[[Ciprofloxacin]] 500 mg PO bid and [[Metronidazole]] 500 mg PO tid


==See Also==
==See Also==
[[Anorectal Disorders]]
 
*[[Special:MyLanguage/Anorectal Disorders|Anorectal Disorders]]
 


==External Links==
==External Links==
[http://vimeo.com/59270692 Rob Orman Lecture]


[[Category:GI]]
*[http://vimeo.com/59270692 Rob Orman Lecture]
 
 
==References==


==Sources==
<references/>
<references/>
[[Category:GI]]
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Latest revision as of 21:39, 4 January 2026


Background

Anorectal abscess types and their locations.
  • Usually begin via blocked anal gland (leads to infection/abscess formation)
    • Can progress to involve any of the potential spaces.
Perianal Ischiorectal Intersphincteric, deep postanal, pelvirectal
Epidemiology Most common Second most common Least common
Symptoms Located close to anal verge, posterior midline, superficial tender mass Larger, indurated, well-circumscribed, located laterally on medial aspect of buttocks Rectal pain, skin signs may not be present
Comments High incidence of fistula formation even with drainage Constitutional symptoms often present


Risk Factors


Clinical Features

Perianal abscess.
Perianal abscess.
  • Worsening pain around bowel movement, with decreased pain post rectal evacuation
  • Perirectal abscesses often accompanied by fever, leukocytosis
    • May only be palpable via digital rectal exam
    • Perianal abscesses typically do not cause fever in immunocompetent individuals
  • Tender inguinal lymphadenopathy may be only clue to deeper abscesses


Differential Diagnosis

Anorectal Disorders

Non-GI Look-a-Likes

Skin and Soft Tissue Infection

Look-A-Likes


Evaluation

  • CT with IV contrast can be useful to define deep abscesses (especially with pain out of proportion to exam)
  • May consider ultrasound or MRI as alternatives


Management

  • Isolated perianal abscess is only type of anorectal abscess that should be treated in ED
    • Consider either linear incision with packing, elliptical incision, or cruciate incision without packing
    • Frequent sitz baths
  • All perirectal abscesses (ischiorectal, intersphincteric, supralevator) should be drained in the OR
  • All anorectal abscesses require surgical referral and follow up


Antibiotics

Causative organisms: Mixed infection with fecal flora for anaerobes and Gram Negatives (Bacteroides fragilis and Escherichia coli)

Use is controversial

Treatment options:


Disposition

Discharge

  • Perianal abscess


See Also


External Links


References

  1. ↑ BMJ Best Practice Anorectal abscess http://bestpractice.bmj.com/best-practice/monograph/644/treatment/step-by-step.html
  2. ↑ Guidelines.gov - Practice parameters for the management of perianal abscess and fistula-in-ano.http://www.guideline.gov/content.aspx?id=36077
  3. ↑ Mocanu V, Dang JT, Ladak F, et al. Antibiotic use in prevention of anal fistulas following incision and drainage of anorectal abscesses: A systematic review and meta-analysis. Am J Surg. 2019;217(5):910-917.
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