Tapeworm cysts. Endoscope view of tapeworm cysts (lumps and swellings) in the fimbriated end of a Fallopian tube. The fimbriated end is the end that is adjacent to an ovary (white, centre). The other end is attached to the uterus (partially seen at lower right). These are hydatid cysts, resulting from hydatidosis (or cystic echinococcosis), and form around the larvae of a tapeworm (Echinococcus granulosus). Transmission of larval eggs from the intestines of carnivores, usually dogs, is accidental, and humans do not form part of the tapeworm's life cycle. The liver is most commonly infected, though every organ can be affected. The slow-growing cysts may be surgically removed.