Answer to Case 563

Answer to Parasite Case of the Week 563: Anisakid larva, notAnisakisspecies.As noted by Marc Couturier, this case has a " very nice and clearly defined intestinal caecum [or ' cecum ' for my United States readers]. Lips are visible on the worm and the general size would point again to an Anisakidae member. Coughing up and the abdominal pain are helpful clinical correlates as well. " Blaine also added some helpful information regarding the diagnostic features of anisakids: " Based on the anteriorly-directed cecum, this is eitherPseudoterranovaorContracaecum. Unfortunately it is not possible to definitively tell from the image if a posterior ventricular appendix is present (Contracaecum) or absent (Pseudoterranova).Anisakisspecies lack both. " He also noted that all 3 genera may have an anterior boring tooth.The arrow in the following image points to the anteriorly-facing cecum.Thanks again to Idzi for donating this beautiful case. I thought that it nicely complimented last week ' s case, which had a nice clinical (endoscopy) image but lacked a view of the defining morphologic features.
Source: Creepy Dreadful Wonderful Parasites - Category: Parasitology Source Type: blogs