Answer: Entamoeba histolytica/dispar Congratulations to all of the viewers who wrote in with the answer – you recognized that the morphologic features and size were consistent with these two closely related protozoa. E. histolytica is a recognized pathogen, although it only causes disease in approximately 10% of the people it infects. E. dispar, on the [...]
Here’s a more straight-forward case than our recent ones: The following object was seen on stool ova and parasite examination and measures approximately 15 micrometers (Modified Trichrome stain, 1000x).
Answer: proglottids of the broad fish tapeworm Diphyllobothrium latum. Congratulations to everyone who got this right! Also in the differential would be proglottids of Taenia spp. and artifacts such as onion skin which may be passed relatively intact and mimic tapeworm segments. However, the diagnosis is easily made by examining the central proglottid structures which [...]
The following was ‘passed’ in the stool of an otherwise asymptomatic 50 year old woman. (images courtesy of Dr. Washington Winn, Fletcher Allen Health Care, VT) Identification?
Answer: Rhinosporidiosis (infection with Rhinosporidium seeberi) Congratulations to Anonymous (x 3!), Kenneth, Chris, Victor, and Santoshpath who all got this correct! The keys to the diagnosis is the clinical history (location in nasal mucosa), exposure history (India), and histopathologic features of a polypoid mass containing mature sporangia (large, thick-walled spherical structures) and smaller internal sporangiospores [...]
Here’s a challenge for all of you: Nasal polyp removed from a 50 year old Indian man with complaints of chronic nasal obstruction. Histologic exam reveals the following:
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