Children between the ages of 5 and 15 years frequently have recurring attacks of abdominal pain, the cause for which it is difficult to determine. Pyelitis is common in infancy and childhood and the cure is sometimes hard to accomplish. In these two conditions roentgen-ray examinations are of great assistance in determining the presence or absence of a definite pathologic lesion in the kidney.
In recurring attacks of abdominal pain, diseases of the gastro-intestinal tract, enlarged mesenteric glands or lesions of the kidney must be considered carefully in every instance. The diseases of the gastro-intestinal tract which most frequently cause such attacks of pain are acute or subacute appendicitis, and congenital malformations. Acute appendicitis can be diagnosed usually by the physical signs, especially if accompanied by a leukocytosis. The congenital abnormalities give symptoms by producing temporary partial obstruction or chronic delay in emptying the intestine with constipation. A barium meal