A 38 year old man had suffered from HIV for over a decade.The many side effects of his anti-retroviral therapy regimen depressed him,and he persuaded himself to stop taking the drugs.He was brought to the Emergency Department by his mother because he had become unresponsive.She related that he had complained of a severe headache just prior to losing consciousness.Unfortunately,he expired before any therapy or diagnostic tests could be performed.An autopsy was requested by his mother,and a representative section of the brain is shown in the accompanying high power photomicrograph,stained with the mucicarmine method (which stains mucin) .Which one of the following is the best diagnosis? 
Definitions:
Lab
Short for laboratory, a controlled environment where scientific research, experiments, and measurement are carried out.
Matrix
A surrounding substance or environment in which something else develops, operates, or is contained; in biology, the intercellular substance of a tissue.
Modified Wave
A scheduling strategy used in healthcare settings to allow for both walk-in and scheduled appointments, aiming to reduce waiting times and improve patient flow.
Cluster
A group of similar things or people positioned or occurring closely together.
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