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Image of the Week for February 9, 2009

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Actinomycosis

Actinomycosis. A sulfur granule from an actinomycotic abscess (hematoxylin-eosin stain). While pathognomonic of actinomycosis, granules are not always present. They represent calcified colonies of the organism.

See Actinomycosis in Red Book Online text
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