What are the histological findings characteristic of acute toxoplasmosis?

Updated: Mar 08, 2019
  • Author: Murat Hökelek, MD, PhD; Chief Editor: Michael Stuart Bronze, MD  more...
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In acute toxoplasmosis, lesions are composed of central necrotic foci with varying petechiae rounded by acute and chronic inflammation, vascular proliferation, and macrophage infiltration. Tachyzoites and bradyzoites in tissue cysts may be detected at the periphery of the necrotic foci. T gondii are commonly found on hematoxylin and eosin or Giemsa stains. However, parasites can be more easily described via immunohistochemical staining. The blood vessels in the area of necrotic lesions may demonstrate distinguished intimal proliferation or frank vasculitis with thrombosis and fibrinoid necrosis.

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