When treating peritonitis, patients should take a semi-sitting position, reasonably choose antibiotics, carefully stop bleeding after gastrectomy and place drainage tubes, which can effectively prevent the formation of subphrenic abscess. Even in the early stage of subphrenic abscess formation, inflammation can be subsided and absorbed by antibiotics and supportive therapy. However, after several weeks of treatment, if the fever persists and the patient is weak, it is still appropriate to drain in time. Ultrasound-guided puncture and drainage is a simple and effective treatment for subphrenic abscess with deep position, small abscess cavity and thin pus. Surgical drainage is still suitable for patients with large abscess cavity, thick abscess wall or multilocular abscess.

2. Treatment of pelvic abscess

Incision was made through the anterior wall of rectum or the posterior fornix of vagina, soft silicone tube was placed for drainage, and the catheter was removed 3 ~ 4 days after operation. Continue to apply antibiotics, hot water sitz bath, perineal physiotherapy and other treatment measures to promote inflammation regression and absorption.

3. Intestinal abscess

Multiple small abscesses can often be absorbed by themselves after antibiotic treatment. Larger abscesses need laparotomy, drainage of pus, removal of pus wall, washing with a large amount of physiological saline or antibiotic solution, and generally no drainage.