My 12 yr old was having severe abdominal pain so I took her to ER. They performed CT scan to rule out appendicitis and discovered 4cm ovarian cyst. They did not believe this was the source of the pain though because the pain eased up but the cyst was still there. The dr did, however, think it was odd for the cyst to be present when she is due to start her period. She said cysts usually appear and/or rupture 2 weeks prior to period. Could this be the cause of abdominal pain? Is it strange that a 12 yr old would have a cyst when her period is due? I'm just confused and wanting to help her get out of pain. Thanks for advice!