A 3-Week-Old Boy Was Taken to a Pediatrician Because of Repeated

A 3-week-old boy was taken to a pediatrician because of repeated vomiting and reluctance to feed. On questioning, the mother said the child had started to vomit on the first day of life and has vomited at least once a day since then. Early on, the mother had been reassured and told that the baby was taking his feedings too quickly and that the vomiting eventually would cease. While initially accepting this reassurance, the mother now noticed that the child did not seem hungry at feeding time; moreover, she could see that the abdomen was becoming distended. She added that the child definitely was constipated; very occasionally, hard meconium was passed. After a thorough physical examination of the child, the pediatrician made the diagnosis of primary megacolon (Hirschsprung disease) .
-The examination of the child revealed the following possible signs except which?

A) The abdomen was found to be distended.
B) A rectal examination with the gloved little finger resulted in the passage of a large amount of flatus and the abdominal distension became visibly less.
C) A low barium enema followed by an $\mathrm{X}$ -ray examination showed a normal rectum.
D) On the radiograph, above the rectum, a narrowed part of the colon led to a funnel-shaped expansion, which in turn led to a greatly dilated descending colon and transverse colon.
E) On placing a stethoscope on the abdominal wall, the physician could not hear sounds of peristalsis.