magic school bus guro?
the fantastic voyage?
Innerspace... er... guro-ish?
I'm not sure if you can really call it that when it's been the subject of a PG-rated hollywood film. Though maybe if you make it a little less bowdlerised than the movie treatment was?
Fridge realisation: hopefully the bad guy's podule got filtered out by the kidneys or liver / gall bladder or something, otherwise that could cause a lot of discomfort if it ends up returning to normal size after a time.
A subset of anatomy/size-play, I guess.