What are histologic characteristics of primary inoculation lesions in cat scratch disease (CSD)?

Updated: Feb 16, 2021
  • Author: Robert A Schwartz, MD, MPH; Chief Editor: Michael Stuart Bronze, MD  more...
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The primary inoculation lesion site consists of variously shaped (round, triangular, stellate) areas of necrosis or necrobiosis surrounded by an inner zone of palisading epithelioid histiocytes with a few multinucleated giant cells and an outer zone of lymphocytes. Organisms (visualized with the Warthin-Starry stain or the Brown-Hopp modification of the Gram stain) appear in the necrotic areas singly, in chains, or in clusters.

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