Neonatal small left colon syndrome is a cause of functional colon obstruction in newborn infants, with a high association of maternal diabetes. There has been much confusion regarding its relationship to meconium plug syndrome and aganglionosis. Six cases of aganglionosis (2 in infants of diabetic mothers) were encountered in which the radiographic findings were identical to small left colon syndrome, indicating the need for caution in dismissing aganglionosis solely on the basis of a small left colon seen radiographically in a newborn infant with colon obstruction. Small left colon and meconium plug syndrome are overlapping entities in the total spectrum of functional intestinal obstruction in newborn infants.
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