[Concordant monocytic leukemia in twin infants].

Acute monocytic leukemia was diagnosed almost simultaneously in 6-month-old male identical twins. Inspite of chemotherapy one twin died of disseminated intravascular coagulation with pulmonary haemorrhage; the other one, however, went into long-term remission. Conception of the twins had taken place inspite of intrauterine device (copper T).