Answer: Not a human parasite
I apologize to my readers that I don't know exactly WHAT this is. A consensus of knowledgeable parasitologists thought that this was not a human parasite, and possibly an artifact or fungal element. Meanwhile, my mycology colleagues did NOT think that this was a fungal element. Responses from the viewers also included Turbatrix aceti (vinegar eel) and hair.
The good news for this patient is that this is not a human pathogen and simply an incidental finding.
Thank you all for writing in with your interesting ideas!