This case was signed out as "Not a human parasite. Most closely food material."
Specifically, we thought this looked like a citrus fruit juice sac (the little pieces of a citrus fruit like an orange or grapefruit).
Go the the Visual Dictionary for a nice schematic of what I'm referring to.
In order to prove our hypothesis, one of our lab techs sacrificed her orange and we dissected it. I think the resemblance to our specimen is clear: