15th February 2025

A 22-year-old woman is brought to the Emergency Department unconscious.

A 22-year-old woman is brought to the Emergency Department unconscious. A friend reports spending the day with her, during which she appeared well and asymptomatic. In the evening, the friend accompanied her to a nightclub and witnessed her taking illicit drugs.

CT head scan shows cerebral oedema. 

What is the most likely diagnosis? 

Select the SINGLE most appropriate option from the list below. Select ONE option only.