i am guess that eggs of Schistosome mansoni and Schistosoma haematobium when shedding inside the body , its may be attacked by immunological cells and formed the immune complex witch may be developed to tumers
Cancer of the intestine and bladder can be associated with schistosomiasis. There might be a hormonal influence. See: Botelho, M.C. et al. 2015. The role of estrogens and estrogen receptor signaling pathways in cancer and infertility: the case of schistosomiasis. Trends in Parasitology 31: 246-250.
As for the granuloma formation and subsequent fibrosis that occurs when eggs are trapped in tissue, bilharzial lesions can superficially resemble tumours. Therefore, some straightforward differential diagnosis is involved.
Is there any chance to infect human with hydatidosis when the mucous membrane of the eyes contaminated with the contents of a rupture hydatid cyst that isolated from other infected patient by surgery?