https://www.independent.co.uk/life-style/health-and-families/health-news/woman-diagnosed-with-evil-twin-teratoma-tumour-warns-others-to-act-on-symptoms-a7049846.html
https://healthengine.com.au/info/testicular-cancer-teratoma-of-the-testicle
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5953511/
https://phys.org/news/2017-05-ovarian-teratoma-teeth-15th-century.html
https://en.wikipedia.org/wiki/Teratoma
https://www.healthline.com/health/teratoma
https://bmcwomenshealth.biomedcentral.com/articles/10.1186/1472-6874-14-57
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3800651/
https://www.sciencealert.com/a-tiny-brain-skull-and-hair-have-been-extracted-from-a-teen-s-ovary
https://www.ncbi.nlm.nih.gov/pubmed/14745894
https://www.livescience.com/50600-embryonic-twin-teratoma.html
https://www.theguardian.com/commentisfree/2015/apr/27/teratoma-tumour-evil-twin-cancer