intervent clinical neonate the diagnosis is suspected discharge signs of intestinal on the basis of nium. In obstruction or failure to pass meco Pre oper of infants and children the history an important part The chil diagnosis and is pation. On typically includes a chronic pattern of consti conditio internal examination the rectum is empty feces, the withstar sphincter is tight, and of stool and often th accumulated leakage of liquid short. A gas may occur if the aganglionic segment is fiber. h between barium enema often demonstrates transition zone tions th the the dilated proximal colon (megacolon) and the Phy aganglionic distal segment. However, this typical megacolon sures t and narrow distal segment may not develop until the age of 2 Chapte months or later.