Enterobius vermicularis (pinworm) in appendix (HES stain)

France, CHU Necker Parasitologie-Mycologie

Roundworm (Nematode) when cut. From the periphery to the central part of the section, one can see the external cuticle with two lateral cords, then rare large muscle cells that protrude into coelomic cavity (meromyarian type), and finally the digestive tract and the uterus.