Monday, December 18, 2017

Case of the Week 473

The following structures were seen in a trichome-stained stool specimen. They measure approximately 10 to 20 micrometers in diameter. Identification?




19 comments:

Anonymous said...

A mix of Blastocystis species and pollen grains. The overall green color is quite festive.
Florida Fan

ali mokbel said...

Blastocystis hominis cyst-like structures.

Graham said...

I assume the query is about the pollen as the Blastocystis cells are not visible in all three images.

Idzi P. said...

Definitely cysts of Blastocystis hominis (in the first picture) and pollen grains -probably of Oleaceae- (in all 3 pictures).

Idzi P. said...

PS: These pollen would make nice Christmas decorations... the nice green color would perfectly match with my Christmas tree!
;-)

William Sears said...

Not parasite, pollen?

Anonymous said...

Blastocystis in the first image and pollen (so beautiful) in all three images.
BW in vt.

Sheldon Campbell said...

I think it's all pollen; are the putative Blastocystis in figure 1 really convincing?

ali mokbel said...

Dear colleagues: Dr. Pritt strictly mentioned "10 to 20 micrometers in diameter" in the text. So, don't be misleaded about pollen grains which are much larger in size. Focus on the other smaller structures.

ali mokbel said...
This comment has been removed by the author.
Agnes K said...

I agree, Blastocystis and pollen (the bigger size, double walls with striate between the walls )in the first picture and pollen in the other picture

Ozgur KORU said...

Large and green stained cells are geranium pollen cells. Smaller cells are Blastocytis spp. cyst-like forms stained with trichrome. The nuclei in the peripheral cytoplasmic rim are visible, staining purple or red.

Idzi P. said...

The pollen could indeed be from the Geraniaceae as Ozgur suggests. Geraniaceae pollen also have three lobes. Although I would stay with Oleaceae pollen. The lobes of Oleaceae are more rounded. A useful internet link for pollen: https://globalpollenproject.org/Taxon?rank=Family&page=2

Anonymous said...

I totally agree with Idzi. By the way, thank you for the pollen web link. It's very interesting!
Luis

Anonymous said...

Granuli tripilari di polline. Blastocystis hominis nella prima foto

Carlo Alberto Varlani

Dario Campese said...

Pollen

Anonymous said...

I'm no palynologist, but it looks like Brassicaceae pollen to me. A quick image search turned up some very similar grains with size listed as 20 um.

- Mark Fox

Swapan Nath said...

Can you post the case Hx that the parasitology lab images are linked to?
Thank you.

Anonymous said...

PS: volevo dire che nella prima foto, oltre al polline, c'รจ Blastocystis hominis

Carlo Alberto Varlani