<unk>  involves an enlargement of the colon caused by a bowel obstruction resulting from an aganglionic section of bowel. The condition, in which the normal enteric nerves are absent, begins from the anus and progresses proximally. The length of affected bowel varies, rarely extending more than approximately one foot
Hirschsprung's disease
Pseudomembranous enterocolitis
Meckel's diverticulum
Hiatus hernia
Intestinal malrotation
Imperforate anus
Small left colon syndrome
Mirizzi's syndrome