Yes blood clots.
Microplastics Found in Blood Clots in Heart, Brain, And Legs
Earlier this year, we got news from a landmark study that microplastics – tiny shards of plastic shed from larger chunks – had been found inside more than 50 percent of fatty deposits from clogged arteries. It was the first data of its kind to draw a link between microplastics and their impact on human health.
Now, a new study from researchers in China reports finding microplastics in blood clots surgically removed from arteries in the heart and brain, and deep veins in the lower legs.
https://www.sciencealert.com/microplastics-found-in-blood-clots-in-heart-brain-and-legs