Liver failure and neurologic disease in a patient with homocystinuria.

A homocystinuric patient with the typical clinical and metabolic features of the disorder started treatment at 22 years of age. A diet with controlled methionine intake resulted in good metabolic control for five years, but control could not be attained for the following 1 1/2 years. This was accompanied by the development of paraparesis and increasing liver failure.