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 Answer to theParasite Case of the Week 682:Schistosoma mansoniegg.The following post is from our first ever guest author, Hadel Go. I think you will all agree that Hadel did an outstanding job writing up the answer to the case of the week, and that this is truly one of the best case answers we have had on this blog.__________________________________Hadel Go, Medical Student, Guest AuthorThis is aSchistosoma mansoniegg in lung tissue as many of you correctly identified in the comments. The large lateral spine is a dead giveaway and creates the “quote bubble” morphology mentioned by Jacob @eternalstudying on Twitter. See more images here:Schistosoma mansoni, eggs, tissue (parasitewonders.com).Here is an image of a S. mansoniegg in an unstained stool wet preparation.The burning question in this case is: what is aSchistosoma mansoniegg doing in the lung?Typically,S. mansonieggs are found in the stool, intestinal tract, and liver of infected humans. Paired adults (male and female) anchor themselves in a venule of the intestinal wall (often in the inferior mesenteric veins) and release eggs. Some of these eventually make their way through the intestinal wall into the lumen and out of the body with the stool, thus allowing the parasite ' s life cycle to continue. However, many of the eggs remain in the venule and travel via the portal circulation to the liver, where they become lodged and cause granulomatous inflammation.Chronic infections and high parasite burden can...
Source: Creepy Dreadful Wonderful Parasites - Category: Parasitology Source Type: blogs