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Bovine tuberculosis: Florid granulomatous lymphadenitis

Note the florid diffuse granulomatous reaction replacing the normal tissue of the lymph node.  The cut surface of the inflammatory reaction reveals a solid, glistening tissue without any indication of necrosis or of encapsulation.  These lesions histologically usually lack the presence of acid-fast bacillli although they are routinely cultured from this type of lesion

Nick Kriek