A sulfur granule is depicted in an abscess in a case of thoracic actinomycosis. The granules are composed of branched,

gram-positive filaments of Actinomyces israelii. Though these organisms resemble fungi morphologically, they are bacteria

of the Order Actinomycetes; they are anaerobic. They lack mycolic acid in cell walls and thus are not acid-fast.


From the slide collection of the late Dr. Charles Kuhn



1 minute clinical correlation

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