Posterior reversible encephalopathy syndrome (PRES) is an acute central nervous system disorder
characterized by reversible brain vasogenic edema.
We report here a new case of a nine-year-old boy with B-cell acute lymphoblastic leukemia (B-ALL) who developed
PRES secondary to induction chemotherapy including dexamethasone (dexamethasone®), vincristine (oncovin®),
daunorubicin (adriblastine®) and intrathecal injection. Cerebral magnetic resonance imaging (MRI) showed high signal
intensity on T2 at cortical and sub cortical region of parieto-frontal and parieto-occipital lobes. The patient was put under
sodium valproate (depakine®) and we decided to continue dexamethasone (dexamethasone®) and daunorubicin
(adriblastine®) injection. The MRI, after four weeks, was normal. So, we resumed vincristine (oncovin®) and we started
L-asparaginase injections. Then, the outcome was favorable.
The treatment of PRES is based on the withdrawal of the triggering factor to avoid the risk of irreversible lesions. But, due
to the severity of leukemia the discontinuation of chemotherapy is difficult because of the risk of disease progression.