Congenital methemoglobinemia is typically benign and should be observed. If methemoglobinemia symptoms occur the person should be taken to the hospital for treatment.

The congenital form is the most severe, although patients live, on average, until they are 45 years old.

One of the most common treatments is amputation, and is almost always life-shortening, and can be fatal.

disease (70%), trauma (22%), congenital or birth defects (4%), and tumors (4%).

With treatment most infants with congenital CMV survive, although almost all suffer from its effects.