The young woman’s ovaries are stimulated, using fertility hormones, over 10-12 days to produce a number of eggs. The process also requires vaginal ultrasounds are used to visualize the maturing eggs. The eggs are fertilized through in-vitro fertilization with sperm from a partner or donor to create embryos. The embryos are kept frozen until the young woman is ready to have children. At that time the embryos are thawed and implanted in her uterus. This process can be performed before or after the completion of treatment. This process is less commonly used in adolescents as it requires sperm to fertilize the eggs.