Cystic fibrosis presenting with anemia and hypoproteinemia in identical twins.

Cystic fibrosis of the pancreas is a recessively inherited disorder generally considered 
to result in chronic pulmonary or digestive symptoms. Therefore, it may 
not be readily appreciated that this disease can also present with 
anemia, edema, and hypoproteinemia, especially in infants taking breast milk or 
soy-based formulas. The following example involving monozygotic twins given cow's milk 
formula since birth will serve to illustrate this association. 