• Courtesy of Hans E. Grossniklaus, MD.
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    Ocular Pathology/Oncology

    Toxoplasmic chorioretinitis. A, Chorioretinal scars with pigmentation (double arrow) typical of prior infection with toxoplasmosis. Active retinitis (arrowhead) and perivascular sheathing (arrow) are present. B, Cysts (arrow) and released organisms (tachyzoites, arrowhead) in active toxoplasmosis (H&E stain).