Answer to the Parasite Case of the Week 735: Echinococcus species.
The diagnosis can be made by the finding of the characteristic protoscoleces. As noted by Florida Fan, "On a closer look, the hooklets are clearly visible as well as the numerous calcareous particles. Since there is one cyst, the indication is that the agent is Echinococcus granulosis.
A Hamburg-based Oregon alumni further noted that for E. granulosus, "The liver is the most frequent location of echinococcal cysts (approx. 70% of cases). The lungs are the second most common location."
Thanks again to Felicity from my lab to taking these beautiful photos!