We present a 6-year-old female with B-cell acute lymphoblastic leukemia admitted for medullary relapse five years after initial diagnosis. Her re-induction chemotherapy included vincristine, dexamethasone, pegylated asparaginase, doxorubicin, and intrathecal methotrexate and cytarabine. While severely neutropenic on prophylactic micafungin, she developed headache, dizziness, fever, and seizures. Brain magnetic resonance