Osteomalacia complicating a blind loop syndrome from congenital megaesophagus-megaduodenum.

A young female with osteomalacia complicating a blind loop syndrome associated with congenital megaduodenum is described. In this case, the correction of vitamin D malabsorption by administration of antibiotics highlights the role of massive intraluminal bacterial overgrowth from destruction of vitamin D, or decreased unicellar solubilization due to deconjugation of biliary acids. The importance of cutaneous vitamin D synthesis in patients with osteomalacia of gastrointestinal origin is emphasized. The detection of megaduodenum and megaesophagus in the patient's father may be the first report of a familial association of these gastrointestinal abnormalities.