Acute perianal necrotizing fasciitis Perianal necrotizing fasciitis is a rapidly developing perianal disease with severe systemic symptoms and a high mortality rate. If treatment is delayed or improperly treated, it will soon lead to necrosis of large areas of perianal skin and fascia, and spread to the scrotum and penis and to the lower abdomen to complicate gas gangrene. Death often occurs from infectious shock or other complications. A total of 25 cases were admitted to our department during 4 years, and all were cured by comprehensive treatment. 1, clinical data 25 cases, all male, age 25-73 years old, average 49 years old, the cause of onset, deep anal abscess delayed treatment, which led to necrotizing fasciitis in the anal region 3 cases, anal abscess mistaken as hemorrhoids injection therapy and led to necrotizing fasciitis in the anal region 7 cases (drug unknown), internal hemorrhoids after injection and led to this disease 3 cases (drug unknown), the anal region of the perineum after trauma debridement and suturing The disease was caused by secondary infection in 3 cases, including 4 cases with lesions in the perianal area, 5 cases with lesions in the perianal area, buttocks and groin, and 7 cases with lesions in the anal area, buttocks, groin, small abdomen, scrotum and penis. There were 10 cases with fever above 39℃, 6 cases with fever below 39℃, 1 case with diabetes mellitus, and 1 case with tuberculosis. 2, treatment methods (1) incision and drainage Patients were placed in a lithotomy position with epidural anesthesia or sacral anesthesia, routinely disinfected, placed cavity towels, saw the swollen necrotic rupture incision, separation and excision of necrotic fascial tissue, because the lesion is deep, often exceeding the surface display range, so in the lesion area should be widely incised, including the edema around the wound or subcutaneous emphysema area to fully reveal, explore the extent of the lesion, and excision of necrotic fascial cavity muscle groups The depth and scope of incision should be determined by the extent of necrosis, especially the deep rectal pus cavity should be exposed, so that the drainage is unobstructed, in the small abdominal incision, attention should be paid to protect the pelvic organs, and in the scrotal incision, attention should be paid to protect the exposed testes. And try to make the plasma bloody exudate and pus flow out of each drainage cavity, that is, repeated flushing with oxidant, and then repeated flushing with 5% metronidazole after drainage with gauze, deep pus cavity can be fixed with drainage tube, postoperative daily flushing as above, and at the same time clean change of medicine, to be incision pus cavity exudate reduced when can be flushed every other day, must clean change of medicine every day, depending on the development of the disease, if there is poor drainage or necrotic cavity If there is still existing, the incision can be supplemented again and should not be delayed palliatively. (2) Immediate postoperative anti-infection and correction of electrolyte imbalance High-dose penicillin is the main drug, supplemented with metronidazole or tinidazole and other anti-anaerobic drugs, if necessary, infusion to supplement human protein and various amino acids. The shortest hospitalization time was 30 days, the longest was 68 days, and the average hospitalization time was 48 days. 4.Discussion (omitted)