<prompt> Which of the following ovarian tumor is most prone to undergo torsion during pregnancy :Serous cystadenomaMucinous cystadenomaDermoid cystTheca lutein cyst  <response>: A benign cystic teratoma is the most common neoplasm to undergo torsion, and it to the MC benign tumor diagnosed during pregnancy. A benign cystic teratoma is synonymous to dermoid cyst. REF : gynecology book of shaw 17th 