Sclerosing encapsulating peritonitis (SEP) is an uncommon condition characterized by the encasement of small bowel due to a thick fibrotic coverage. This entity is usually related to several diseases, highlighting among them the peritoneal dialysis, and less frequent is the primary or idiopathic peritoneal sclerosis or cocoon syndrome. SEP is clinically variable, depending on the severity and duration of the disease, the underlying causes and the patient's immune status. The most common presentation is intestinal obstruction. It is rarely presented as a complication such as enterocutaneous fistulas, intestinal necrosis and malnutrition. Intestinal perforation is quite uncommon in patients with SEP. We present a case of cocoon syndrome in a 67-year-old man and describe his clinical onset, radiology and anatomical pathology findings.