Anal abscess is an acute purulent infection in the soft tissues around the anal canal and rectum or in the interstitial space around them, and the formation of an abscess, called perianal and rectal abscess. Typical symptoms: distension and discomfort in the rectum and anus, persistent severe pain around the anus, aggravated by pressure or coughing, inconvenience in walking, restlessness, and no symptoms of systemic infection. Examination: 1. Routine anal examination Look: see the scope of redness and swelling, see whether there is mucus flowing out at the dentate line, and judge the location of the internal opening by this.
feel: finger diagnosis is very important, whether low or high, finger diagnosis is sometimes more accurate than ultrasound. 2.Blood test The severity of the abscess can be judged by the blood test. Ultrasound examination Ultrasound is now widely used in the diagnosis of anal fistula and perianal abscess. An experienced examiner can accurately describe the direction of the pus cavity and fistula, the relationship with the sphincter, and the location of the internal opening. 4.CT and magnetic resonance examination are mainly used for high level abscesses that cannot be seen or felt.