Definition An abscess is a collection of pus in any part of the body that, in most cases, causes swelling and inflammation around it. Causes, incidence, and risk factors Abscesses occur when an area of tissue becomes infected and the body's immune system tries to fight it. White blood cells move through the walls of the blood vessels into the area of the infection and collect within the damaged tissue. During this process, pus forms. Pus is the buildup of fluid, living and dead white blood cells, dead tissue, and bacteria or other foreign substances. Abscesses can form in almost any part of the body. The skin, under the skin, and the teeth are the most common sites. Abscesses may be caused by bacteria, parasites, and foreign substances. Abscesses in the skin are easy to see. They are red, raised, and painful. Abscesses in other areas of the body may not be obvious, but they may cause significant organ damage. Some specific type of abscesses are: Abdominal abscess Amebic liver abscess Anorectal...
Definition Perirenal abscess is a pocket of pus caused by an infection around one or both kidneys. Alternative Names Perinephric abscess Causes, incidence, and risk factors Most perirenal abscesses are caused by urinary tract infections that start in the bladder, spread to the kidney, and then spread to the area around the kidney. Other causes of perirenal abscess include surgery in the urinary tract or reproductive system and bloodstream infection. The biggest risk factor for perirenal abscess is kidney stones that block the flow of urine and provide a place for an infection to grow. Bacteria tend to stick to the stones and antibiotics can't kill the bacteria there. Stones are found in 20 - 60% of patients with perirenal abscess. Other risk factors for perirenal abscess include: Diabetes Having an abnormal urinary tract Trauma
Definition An anorectal abscess is a collection of pus in the area of the anus and rectum. Alternative Names Anal abscess; Rectal abscess; Perirectal abscess; Perianal abscess; anal gland abscess; Abscess - anorectal Causes, incidence, and risk factors Common causes of anorectal abscess include: Blocked gland in the area Infection of an anal fissure Sexually transmitted infection Deep rectal abscesses may be caused by intestinal disorders such as Crohn's disease . The following factors increase your risk for an anorectal abscess: Anal sex Chemotherapy drugs used to treat cancer Diabetes Inflammatory bowel disease (Crohn's disease and ulcerative colitis ) Use of medications such as prednisone Weakened immune system (such as from HIV / AIDS ) The condition may occur in infants and toddlers who are still in diapers and who have a history of anal fissures.
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