Welcome back to Case of the Week! It’s been a while since our last post due to the holiday, but now we’re back on schedule with a fun video for you: The following insect was removed from the flank of a Medical Resident from Minnesota who had mistaken it for a ‘mole’ or ‘skin tag’. [...]
Question 1. Malaria due to Plasmodium malariae infection. Notice that there is no stippling present, and that the infected red blood cells are the same size or slightly smaller than the neighboring uninfected cells. Also shown here are the ‘classic’ stages of P. malariae in peripheral blood. Question 2. From top to bottom, the forms [...]
The following images were taken from a Giemsa-stained peripheral blood smear. The different stages of the organism shown represent a single species, and each stage is characteristic for this species. The stages are so characteristic, in fact, that each has an ‘unofficial’ name (e.g. nick-name) or description. Question 1 – What organism (genus and species) [...]
Answer: Not a parasite. Most closely resembles pollen. I included this case since the object in some of the photos resembles a helminth egg (Toxocara canis or Capillaria spp. comes to mind). The key to recognizing that this is not an egg is in the last photograph which clearly shows the pores in the thick [...]
The following were seen in a concentrated wet preparation of stool. No history is available. Identification?
Answer: As stated by cmassey, “Toxoplasma gondii. Criteria: rupturing cyst with what appear to be escaping tachyzoites. Morphology is crescent shape with a large nucleus and they appear to fit in the 4-8um by 2-3um size given in diagnostic literature.” Great job to everyone who wrote in! This case demonstrates a few nice features of [...]
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