you have not mension your age, if older age chances of epethelial carcinoma of ovary is common and in young age germcell tumor
of ovary is common.
you should get done tumor markers : B-HcG, Alpha feto protein, S. CEA, S. LDH, S. CA-125
for detail evaluation of tumor in pelvis,.
raised CA-125 more than 35-40ng/dl is suggestive of ovarian cancer
also get done Color doppler ultrasould for cystic area: if its complex ovarian cyst
than chances of ovarian cancer is high and for further evaluation require CT-Scan Abdomen and pelvis for characterize the malignancy feature and spread.