[Methotrexate poisoning: value of exchange transfusion].

The authors report on a case of methotrexate (MTX) intoxication occurring in a young boy treated for osteosarcoma. Exchange transfusion was shown to be an effective method. Respective indications of MTX removal methods are discussed: haemodialysis and charcoal haemoperfusion should be proposed for massive and acute intoxications; exchange-transfusion may be proposed as a treatment for prolonged and moderate intoxications.