Monday, February 8, 2021

Case of the Week 625

 This week's case was generously donated by Dr. Marijo Roiko, Dr. Shifteh Vahidi, and Ms. Marnie Larsen. Marnie noticed the unusual structure shown in the image below in a urine cytology specimen from an elderly male with a history of hematuria. The structure in the image was observed on PAP stain and was a solitary finding; it measures 125 x 75 ┬Ám.

 

What is this cool-looking object?

13 comments:

Anonymous said...

The clinical history of hematuria, size and shape of the object lead me to Schistosoma haematobium infection. The object corresponds in morphology with a miracidium, the lower end is the papilla. The cilia did not take the stain and is not visible. I found a nice case of Balantidium coli and the cilia of the organism did not stain with Trichrome either.
As to why we found the miracidium instead of the egg, perhaps the urine cooled down at room temperature after collecting and induces its hatching.
Florida Fan

Anonymous said...

rotifer!

Idzi P. said...

This is a rotifer! Dr. Pritt is trying to trick us!
It is a contaminant, found in stale water.
Was the sample collected from the toilet bowl, or from a bucket?

TheOracle said...

Because of dimensions and morphology, it looks like a miracidium of Schistosoma haematobium to me; too bad there are no visible cilia to confirm it.

Italiam new fan!

Anonymous said...

I agree with Idzi and anonymous. I also think it is a rotifer.

Luis H.

Unknown said...

There are reports in the literature of contamination of specimens by rotifers:
https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2303.2003.00022.x
Also, a case posted a few years ago on here:
https://parasitewonders.blogspot.com/2018/11/case-of-week-517.html

Sam said...

Is it a miracidium of Schistosoma haematobium?

Marc Couturier said...

Rotifer, contaminant.

Anonymous said...

Given the history, I think is an egg of Schistosoma hematobium.

Old One said...

I go along with Idz's "bucket" hypothesis. I believe it to be a Bdelloid rotifer with a retracted corona, large orange ovary, with 2 lateral germovitellaria with posterior stomach. Tail section appears to be visibly segmented with one of its toes visible at the terminal segment.

Bernardino Rocha said...

I agree with the Rotifer Hypothesis.

Sir Galahad said...

Si, Rotifero

Anonymous said...

Rotifer