<prompt> Choriocarcinoma is differentiated from invasive mole chorioadenoma destruens by:Presence of high titre of urinary chorionic gonadotrophinPresence of cannon ball shadow in the lungsAbsence of villi structure on histological examine of the lesionAll of the above  <response>: Choriocarcinoma can be considered a carcinoma of chorionic epithelium. The characteristic difference from hydatidiform mole is the absence of villous pattern.refer pgno:172 sheila textbook of obstetrics 2 nd edition 