Thread by @Path_Matt

Congratulations @SJPilon you solved round #8 of #ISpyWithMyMicroscopicEye this case this is a Echinococcosis (hydatid) cyst

Check out my youtube video that describes this case at;

Here is a digital slide that shows the cystic area with interspersed protoscolices

pathpresenter.net/#/public/displ…

Here is a slide that shows the contents of the cyst and gross a gross photo
pathpresenter.net/#/public/displ…

Here is one of my previous #Tweetorial on the topic with a case involving the liver.

https://twitter.com/Path_Matt/status/1061968657557770240?s=20

Here is another case that ruptured and incited a large inflammatory reaction in the overlying pleura. If you look closely you can see some residual hooklets.
pathpresenter.net/#/public/displ…

The hooklets can be nicely highlighted by an AFB histochemical stain.

Some key points on the case:
➡️Most often caused by Echinococcus granulosus
➡️ The definitive host is dogs/wolves
➡️ Intermediate hosts are sheep and humans
➡️ In intermediate hosts a hydatid cyst will form most commonly in the liver, lung or brain

More points:
➡️ FNA or rupture of the cyst can cause a severe allergic reaction
➡️ The hooklets are positive on AFB stains
➡️ The cyst can often rupture into the airway and patients can report coughing up salty material and hooklets can be see on sputum cytology samples

One more point:
➡️ In treated cases only the hooklets may remain which can be highlighted by dropping the condenser on high power