Colonic atresia is a congenital intestinal malformation resulting in a non-latent segment of the colon and characterized by lower intestinal obstruction manifesting with abdominal distention and failure to pass meconium in newborns.

Hydrocephalus is an active distension of the ventricular system of the brain resulting from inadequate passage of CSF from its point of production within the cerebral ventricles to its point of absorption into the systemic circulation.