We were attacked by Bekor Azoctaba, an enormous one-eyed firefly with large mandibles and a leathery carmine exoskeleton, which squirms and fidgets (beware its deadly dust!).
So I mobilized my entire military (squad of 10 mixed weapons, squad of 6 with maces and hammers, squad of 2 wrestlers, squad of 6 marksdwarves) to go fight it. It was in one of the narrower parts of the caverns, and my speardwarf Kadol Thizducim ("Fastenworks") went in first. And besides her loyal war lion, everyone else decided to stay out in the main cavern, amid cries of "I'm sure you can handle it" and "we'll guard the rear".
So Kadol started going about the business of skewering the firefly with her masterwork steel spear, striking various internal organs while being buffeted about by the beast's "deadly dust". Although her lion did not fare so well, by the time she'd fatally lanced its brain she'd suffered no more than a kick to the arm. So I was a little surprised that she then went to rest - it was just one minor bruise after all. That's when I noticed the purple trail she was leaving. Thinking it was beast extract that was going to be spread across the whole fort I had a look and saw that no, it was actually miasma. So I check her status page and *every* bodypart, from limbs and body right down to eyelids was a) rotten and b) swollen with blood. 2 pages of red text. The miasma was from her now decaying form.
She made it to the hospital, stinking up the fortress as she went, and one of our medics attempted to diagnose her. This was apparently unsuccessful, because then the chief medic came up to re-diagnose her immediately after (can't trust the trainees to do it right). With all that rot she was scheduled for cleaning and surgery to every part of her body. But she was having none of it - after a couple of attempts to move her (cancelled: not resting) she told them she was fine and went back to train with her squad, filling the place with miasma. I figured maybe she'd just recover naturally, but further checks showed that she was now blind and the rot was now "advanced" rot.
So I dropped her from her squad (the stink was annoying her already long-patrol-enraged squad) and she then dutifully returned all her gear to the relevant stores (still trailing ridiculous amounts of miasma wherever she went). She then went to the well and cleaned all the forgotten beast extract off herself before deciding that with nothing better to do she may as well go to hospital to rest. Cue another diagnosis and the medics decided she didn't need cleaned anymore (she'd done that herself) and just needed surgery. This time she didn't resist and the surgeon went to start removing rotten tissue (there was still an entry for every single bodypart at this point). He started by excising it from her upper lip, which apparently went well. The chief medic decided to diagnose her again (gets some practice in if nothing else) and this time decided she was cured, and she was free to go.
Sure enough, checking her status all the rot was gone and she could see again (albeit impaired). I guess all the rotting tissue was connected and, like peeling skin from sunburn, the surgeon took great delight in removing all of it in one continuous strip. She's now back with her squad, her vision still impaired and some sensory nerve damage, along with a tiny scar on her arm, but otherwise happily training away. All her bodyparts are still showing yellow, but it doesn't seem to be bothering her and no more treatment is scheduled.
So all in all, she did a lot better than the dwarf that got shot in the lip and died from an infection.