Since this is Case 101, I figured I would give a case that is suitable for “parasitology 101″. Hopefully, you will all enjoy this straight forward case. Identify the following eggs from stool wet preparation. They measure approximately 30 microns in length:
Answer: Amebiasis. This disease is caused by E. histolytica, a protozoan parasite. Most of you recognized the classic “flask shaped” ulcer at low magnification. This type of ulcer is so named because its base is wider than its apex.
The follow sections of colon were taken from a Mexican farmer who presented with acute bowel perforation. Numerous deep and confluent ulcers were seen along the length of the colonic mucosa.
Congratulations to everyone who recognized the bipolar plugs of the eggs inside this cross section of Trichuris trichiura. This was a tricky case, but the location of the worm helps (colon lumen), and the eggs are diagnostic. Although the eggs are reminiscent of hookworm (as suggested by one viewer), that is largely due to the [...]
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