Answer to Case 689

 Answer to theParasite Case of the Week 689:  Anisakid, most consistent with anAnisakisspecies.Hopefully you all had a change to look at the whole slide imageHERE. From its location in the small intestine, deep in the submucosa, one can envision how it may have extended through the wall of the intestine and caused a perforation. Dr. Luca Fanasca noted that " we can clearly see features consistent with an anisakid infection: multilayered cuticle (from a portion which seems detached, in the upper part), polymyarian muscle cells, the beautiful Y shaped lateral chords and the banana-shaped excretory cell. From the quite slender appearance of the lateral cords I think we could suppose this is actually an Anisakissp., but a definitive identification would require the observation of other characteristics like the caecum position and shape, or molecular diagnostics strategies. " Below are some of the key features of nematodes, and anisakids in particular: Features of all nematodes:Acellular outer cuticle (may be adorned projections in some nematodes (e.g., the lateral alae ofEnterobius vermicularis, and the cuticular bosses ofLoa loa)Underlying musculature. The musculature is either flattened (platymyarian) or tall (coelomyarian). The musculature is further categorized by the number of muscle cells: meromyairan (2 to 5 rows) or polymyarian (large number of rows in each sector)Lateral chords Fully-developed intestinal tractSeparate sexes (males and f...
Source: Creepy Dreadful Wonderful Parasites - Category: Parasitology Source Type: blogs