Answer to the Parasite Case of the Week 709: Taenia sp. cysticercus (larval form) in muscle. Since this case was from my archives, I don't know the source of the muscle (i.e., human vs. cow); however, given the number of cysticerci present and the co-existence of Sarcocystis sp. sarcocysts (not shown well, but you can see them if you enlarge the two images), I'm guessing it was a bovine case. Regardless of the origin, the features seen here are characteristic for cysticerci, including the overall shape and size, and the appearance of the internal protoscolex. Note the spiral canal which is often one of the clearest identifying features of the protoscolex.
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