1st August 2023

A 39-year-old man with a background of HIV presents to A&E with fever, headache, and new-onset confusion.

A 39-year-old man with a background of HIV presents to A&E with fever, headache, and new-onset confusion. A CT head scan is performed, as shown below.

Image of CT scan

What is the most likely diagnosis?

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