A patient presents with a painless, indurated ulcer on the genitals (Chancre). Histology shows an infiltrate of plasma cells and endarteritis obliterans. This is typical of:
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Correct answer: Primary Syphilis
The primary stage of syphilis is defined by the chancre. Microscopic features include a dense infiltrate of plasma cells and characteristic vascular changes known as endarteritis obliterans (concentric thickening of the small vessel walls).
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