In a patient with AIDS, a lung wash reveals 'crushed ping-pong ball' appearing cysts on GMS stain. What is the diagnosis?
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Correct answer: Pneumocystis jirovecii
Pneumocystis jirovecii appears as 5-micrometer, cup-shaped or collapsed cysts. These cysts often contain a dark 'comma-shaped' focal thickening and are characteristic of PCP pneumonia.
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