<prompt> Choriocarcinoma is differentiated from invasive mole chorio-adenoma destruens by:Presence of high titre of urinary chorionic gonadotrophinPresence of cannon ball shadow in the lungsAbsence of villi structure on histological examination of the lesionAll of the above  <response>: Choriocarcinoma is characterised by absence of villiHigh titre of urinary chorionic gonadotrophin and cannon ball shadow in the X-ray lungs are found in both choriocarcinoma and invasive mole. 