(Also what's with the close-up of what I assume is skin adnexa? Tell me about that plz)

I was worried it might be something along that line. Girl, I haaaaate sarcoids. : (

Really impressive histology though, there. It's crazy to see the relatively normal epithelium and then....just this huge ocean of not-reallly-dermis

Parasitic cnidarians D :

what in the fresh pedunculated collagenous connective hell is that

Ooo, I'm not so sure but let's see if we get close:

1. Gills look blunted with significant amount of cellular infiltrate. There appears to be a round, multicellular/multinucleate organism within the gills
2. Condition - he's sad : (
3. Cause - Fungal or fungus-like organism, comparing to dog/cat

bob plz stop self-deprecating your child can hear

Thank you so much for sharing them with us!

Yes, histopath can be very pretty stuff.

lol gotta say while i've seen plenty of scabies suspects treated with bravecto and ivermectin, i've never seen actual histopath of the thing

Why was a biopsy taken in this case? Did the animal have another condition, or were these research animals?

1. key histopath features - took me a second to figure out what thin appendage had a little strip of cartilage going down it, but that's an ear. there are things living in that ear skin that do NOT belong there - with a spiky little cuticle suggestive of
2. scabies

3. yuk