In some animals, a sporocyst is a sac-like structure that produces and contains parasite larvae.
Sporocysts are not good things. They are part of how parasites spread and make animals sick.
Examples:
The sporocyst is full of parasite larvae.
The snail has a sporocyst inside it.
The sporocyst makes the animal sick.
The sporocyst is like a yucky bag of worms.
The sporocyst is a gross and scary thing.
The sporocyst is a bad thing for the animal.