Fig. 4. Morphological structure of the cyst wall. Cortical brain photomicrograph shows a thin cyst wall (A). A detailed view shows that the cyst wall is made up of host-nucleated cells indicated by black arrowheads (B). In contrast, tissue cysts seen in organs other than the nervous system show a thicker cystic wall. Such is the case for those tissue cysts observed in the mammary (C–D), adrenal (E) and spleen (F) glands. The most notorious differential feature is the thick collagen outer layer in cysts outside the nervous system (white arrowheads). Bz: bradyzoites. A–B: Giemsa staining; C–D: Masson's trichrome staining. E–F: hematoxilin-eosin staining.

Published as part of Cwirenbaum, Ruth, Schmidt, Alejandro R., PhD, Cortasa, Santiago A., Corso, María C., Vitullo, Alfredo D., PhD, Veronica, Dorfman, B., PhD, Halperin, Julia & PhD, 2021, First record of an infection by tissue cyst-forming coccidia in wild vizcachas (Lagostomus maximus, Rodentia) of Argentina, pp. 52-58 in International Journal for Parasitology: Parasites and Wildlife 16 on page 56, DOI: 10.1016/j.ijppaw.2021.08.002, http://zenodo.org/record/13267426