Diagnosis and management of constipation associated with megacolon        FU Chuan-gang, XU Xiao-dong. Department of Colorectal Surgery, Changhai Hospital, the Second Military Medical University, Shanghai 200433, China
Corresponding  author： FU Chuan-gang,E-mail：fugang416@126.com
Abstract    Constipation associated with megacolon as a special type of intractable constipation is sinificantly different in the etiology, clinical manifestation and especially the managemnt. Depending on the etiology, it can be divided as congenital megabowel or Hirschsprung’s and idiopathic megabowel. And depending on the location of dilatation, it can be divided as megacolon, megarectum and megabowel. Besides the intractable constipation, most of megabowel patients have abdominal distention and may palpate abdominal mass. Imaging examination shows dilated colon and rectum. The management of bowel is difficult due to its rare incidence and complicated situation with high incidence of complication and recurrence.