Unexplained fever
Unexplained hypotension
Weight gain > 5 kg
Dyspnea with pulmonary infiltrates
Pericardial effusion
Pleural effusion
Renal failure
Vascular capillary leak<unk> 
DIC
Never observed beyond induction therapy, when patient has achieved complete response
Retinoic acid syndrome
Sepsis
Down syndrome
Fungal infection
Grey baby syndrome
Pulmonary hemorrhage
DiGeorge syndrome
Pneumonia