Fibrous membrane encapsulation, also known as “abdominal callus”, was named in 1978 and is a relatively uncommon disease in abdominal surgery. It is characterized by a dense, grayish-white, tough, hard and thick fibrous membrane wrapped around all or part of the small intestine. It has been reported as “small intestine cocoon wrapping disease, congenital small intestine confinement disease, small intestine stage fiber wrapping disease, intraperitoneal adhesion intestinal obstruction”, etc. Because of its different etiology and clinical manifestations, it has been inconsistently recognized. Usually, patients are asymptomatic, and 92% of them seek medical attention for intestinal obstruction, of which subacute and chronic intestinal obstruction account for 71.4%, and some patients are found occasionally during abdominal surgery. The incidence of abdominal masses in some patients is 69%. Francis believes that the clinical features of this disease are: 1. young women with unexplained intestinal obstruction. 2. A previous history of similar episodes that may resolve on their own. 3, often presenting with abdominal pain and vomiting, but lacking the four typical symptoms of intestinal obstruction. 4.There is a non-pressure abdominal mass with a soft texture on palpation. Abdominal cocooning is difficult to diagnose preoperatively and is almost always diagnosed intraoperatively. For adolescent females, with no previous history of abdominal surgery and peritonitis or long-term medication, this disease should be suspected when intestinal obstruction and abdominal masses occur.