Spectator
It’s called periosteal reaction. Here’s a few examples I posted already: one, two.
Hi. Try to match the outline of the humerus to that on the radiograph. Then the big bright mass to the right of the humerus (going by the picture) is the cancer. Now see if you can make out the rough outline of it on the radiograph.
The cloudiness you’re seeing is calcification within the tumor. Specifically, the outward “tendrils” (as someone else called it) exploding out from the margin of the humerus is really aggressive periosteal reaction, which I’ve posted a few examples before already: one, two.
I think while the general communities have made it, a lot of niche communities failed to attract enough population to keep on generating more content. As an example, just search for the “Imaginary” series of landscape art communities on the Fediverse (eg. ImaginaryVistas). Many of them don’t have any recent posts or 1 post per days or weeks. That’s not enough to keep people invested. Even the largest digital art community is still mostly carried by 1 person.