RESUMO
A man in his 50s presented with sudden onset expressive aphasia and right-sided facial droop after experiencing coryzal symptoms and malaise for 7 days prior to admission. A brain MRI showed a rapidly progressive mass effect across both hemispheres and cerebrospinal fluid analysis revealed neutrophil predominance with raised protein levels. Acute disseminated encephalomyelitis was provisionally diagnosed, and high-dose methylprednisone was initiated.On admission to the high dependency unit, the patient tested positive for COVID-19 and was treated with appropriate therapeutic agents for severe COVID-19. A subsequent brain biopsy confirmed a demyelinating process, strongly indicating a diagnosis of acute haemorrhagic leucoencephalitis when correlated with the presence of severe oedema on imaging. Nine sessions of plasma exchange were provided over 18 days.At the time of writing, the patient has made an excellent recovery. We urge clinicians to consider this diagnosis and these treatment options for an otherwise devastating condition.