I thought, but could be wrong, that if an
ovarian cyst is malignant, it will grow. Contrary to what many believe,
ovarian cysts are
more common in post-menopausal women than many people realize. And just as in pre-menopausal women, they are usually benign. However, it is concerning that your sister had ovarian cancer. Do you know if you carry a gene for ovarian cancer such as BRCA1, BRCA2, or Lynch Syndrome? These links are helpful:
http://ovaryresearch.com/ovarian_cysts.htm
http://www.ncbi.nlm.