I know this is going to be hard without photos, but here goes...
I shot a youngish roe buck at the weekend. Quite skinny, with somewhat enlarged lymph nodes.
Scattered around the body cavity, there were large numbers of things that looked a little like jelly beans: size and shape of a baked bean (some a bit larger, some smaller), pinkish grey, firmly squidgy like a fruit pastille. They were filled with lots of closely packed, spherical, whitish granules about 0.5mm across.
The main concentration of these things was donw the midline on top of the tenderloins and near the kidneys (where you'd expect to find fat building up on a well fed animal). There wre a few elsewhere as well - for instance one or two under the skin on the neck.