A 68-year-old man presents with fever, rigors, dysuria and perineal pain. He has been unable to pass urine for 10 hours, and examination shows a markedly tender, swollen prostate; gentle examination causes considerable pain. His blood pressure is 105/68 mmHg and temperature is 39.2 °C. Which diagnosis best explains this presentation?
Keep going — a set of ten like this one, one at a time.
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