_:vb50952872 . _:vb50952872 "url:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4467297/"^^ . _:vb50952872 . _:vb50952872 "A choriocarcicoma that develops in the absence of a preceding gestational event."^^ . _:vb50952872 . _:vb50952872 . _:vb50952872 .