[Megarectum in childhood].

The criteria employed in the classification of megarectum in infancy are briefly reviewed and its diagnosis is discussed. Stress is laid on the importance of clyster radiology and rectal manometry. Biopsy extended to the point of true sphincteromyectomy may also prove resolutive. Lastly, infantile neuropsychiatry is unmistakably indicated in diagnosing the psychological origin of many of these forms. Aganglionic forms are quickly described and attention is directed to those due to fibrosis of the inner sphincter. Most of such cases are shown to be of secondary, reactive, rather than primary congenital, origin on histological inspection after surgery. Lastly, consideration is given to essentially psychogenic forms. The picture observed in a case treated by sphincteromyectomy with histological evidence of interstitial fibrosis with muscle and nerve regression suggested that affective disturbances lead first to persistent constipation, followed by abnormal distension of the last segments of the intestine. Subsequent regression results in an organic evolution independent of the original disturbance, so that surgery must be resorted to, as well as neuropsychiatric treatment.