Which one - I don’t see anything but pictures that are rectangles...
Pic 18 is the rectangle. Basically the black and white pictures are fairly obvious. Heck one is even a triangle, certainly not normal.
Each picture has a caption that tells you what it is. Major oddities, with some pictures even showing detachments of cells from the vessel wall, clotting, ect. This is scary stuff, and should be front page news.
Remember these are from autopsies, not some grainy picture of bigfoot. This is the real deal, there is nothing better, for finding out what is going on, than cutting things open and witnessing what is there first hand.