Monday, December 28, 2015

Case of the Week 378

This week's case was donated from one of our superstar pathology residents, Dr. Heidi Lehrke. The specimen was a tan-white tissue, approximately 4 mm x 1 mm x 1 mm, that was obtained during colonoscopy and submitted for histopathologic processing. Stain shown is H&E. Identification?

40x total magnification

100x total magnification

400x total magnification


Anonymous said...

I must confess, reading Histology smear is my Achille's tendon. After staring at the pictures for a long time to no avail, I consulted my trusted reference: CDC/DPDX. Pinworm? No. Hookworm? No. Whipworm? Neither. Flukes? Unlikely.
Finally, the compatible answer came into view:
What lays eggs in a thin shell packet?
The obvious answer: Dipylidium caninum to cat lovers and Dipylidium felineus to Benji's fans.
I found this tape worm on my dogs, and I also found its adult worms on a female patient as well as her cat.
Should I be wrong, then I will learn some more.

Florida Fan

Arthur Morris said...

Certainly a mature gravid proglottid of Dipylidium caninum. The description of the gross morphology is consistent with the "sesame seed" like appearance of a proglottid, though not specific to D.caninum. The presence of numerous egg packets containing a number of oncospheres, however, is characteristic of D.caninum. Lovely staining!

Kamran Kadkhoda said...

I don't believe this is histopathology slide in strict sense to begin with as there's no "tissue" seen here; this simply is a longitudinal section of a fluke containing packets of eggs, most likely of D. caninum.

Bobbi Pritt said...

Actually, histopathology simply refers to the process of fixing, staining and sectioning tissue; it doesn't have to be human tissue, but could be plant, animal or mineral. In this case, the tissue is animal in origin (a tapeworm).