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==Microscopic== | ==Microscopic== | ||
Features: | |||
*Inflammatory infiltrate (key feature @ low power): | *Inflammatory infiltrate (key feature @ low power): | ||
**+/-Plasma cells - subacute. | **+/-Plasma cells - subacute. | ||
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*Microorganisms - '''key feature''' (diagnostic). | *Microorganisms - '''key feature''' (diagnostic). | ||
**Hard to see (even at high power). | **Hard to see (even at high power). | ||
DDx: | |||
*[[Nonbacterial thrombotic endocarditis]] - dirt may mimic micro-organisms. | |||
==Stains== | ==Stains== |
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