| Summary points: | A 16-year-old girl presents with a 2-week history of persistent low-grade fever, anorexia, lymphadenopathy, and arthralgia and is diagnosed with B-precursor phenotype acute lymphoblastic leukaemia. After remission induction chemotherapy, she developed Bacillus cereus sepsis with multiple brain abscesses. Medical history, blood culture, brain magnetic resonance imaging, and electrophysiological studies are described. The authors discuss the importance of neurophysiological tests for the diagnosis of critical illness polyneuropathy and review their successful management approach. |