Anal Abscess

(Anal Rectal Abscess; Anorectal Abscess)
  • Definition

    An anal abscess is a pus-filled pocket located in the spaces around the anus and rectum. An abscess can be found near the surface of the anal opening or deeper in the rectum.
  • Causes

    An anal abscess is caused by a bacterial infection. Infection may occur when there is a blockage in one or more of the anal glands that secrete mucous or fistula tract in the anus or rectum.
    Anal Abscess
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  • Risk Factors

    Anal absesses are more common in men. Other factors that may increase your chance of developing an anal abscess include:
    • Certain conditions, such as Crohn's disease, ulcerative colitis, or sexually transmitted diseases
    • Receptive anal intercourse
    • Medications that suppress the immune system
    • Pregnancy
  • Symptoms

    Symptoms depend on where the abscess is located. An anal abscess may cause:
    • Pain and tenderness radiating from the location of the abscess if it is near the surface
    • Lower abdominal pain if it is located deeper in the rectum
    • Redness and swelling—visible with a surface abscess; also occurs in a deep abscess, but cannot be seen
    • Pus drainage
    • Fever
    Complications of an anal abscess may include:
    • Anal fistula—abnormal channel between the rectum and the surface of the anal skin leading to the outside
    • Systemic sepsis—serious, life-threatening infection that spreads throughout the body
    • Stool incontinence
  • Diagnosis

    Your doctor will ask about your symptoms and medical history. A physical exam will be done. An abscess near the surface of the skin may be visible. A deeper abcsess may require a digital rectal exam. The doctor will feel the inside of your anal canal for any abnormalities.
    Imaging tests to look at anorectal structures may include:
    • Ultrasound
    • MRI
  • Treatment

    Surgical drainage is necessary to treat an anal abscess. The type of procedure depends on the location and depth of the abscess. It is possible that you may have a drain in the wound for up to three weeks to help the healing process.
    Medications
    Antibiotics are generally not necessary, but your doctor may recommend them under certain circumstances. Other medications may include:
    • Over-the-counter or prescription pain medication
    • Stool softeners, fiber, or bulk laxatives
  • Prevention

    To reduce your chance of developing an anal abscess, be sure to manage any health conditions that increase your risk of infections.
  • RESOURCES

    American College of Gastroenterology http://gi.org

    American Society of Colon and Rectal Surgeons http://www.fascrs.org

    CANADIAN RESOURCES

    Canadian Association of Gastroenterology http://www.cag-acg.org

    Capital Health http://www.cdha.nshealth.ca

    References

    Abcarian H. Anorectal infection: Abscess-fistula. Clin Colon Rect Surg. 2011;24(1):14-21.

    Anal abscess/fistula. American Society of Colon and Rectal Surgeons website. Available at: http://www.fascrs.org/patients/conditions/anal%5Fabscess%5Ffistula. Updated October 2012. Accessed November 14, 2013.

    Anal rectal abscess and fistula. Hemorrhoid website. Available at: http://www.hemorrhoid.net/abscess.php. Accessed November 14, 2013.

    Anorectal abscess. John Hopkins Medicine website. Available at: http://www.hopkinsmedicine.org/healthlibrary/conditions/adult/digestive%5Fdisorders/anorectal%5Fabscess%5F134,175. Accessed November 14, 2013.

    Caliste X, Nazir S, et al. Sensitivity of computed tomography in detection of perirectal abscess. Am Surg. 2011;77(2):166-168.

    Schaffzin DM, Wong WD. Surgeon-performed ultrasound: endorectal ultrasound. Surg Clin North Am. 2004;84(4):1127-1149, vii.

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