An aneurysm is a bulge in an artery wall that, if left untreated, can rupture, resulting in death eight out of ten times.

FORBES: By the Numbers

They develop over many years and can rupture spontaneously.

FORBES: The Health Insurer Could Be A Better Friend

However, taking a less powerful drug called indomethacin can delay the rupture of the ovarian follicle.

BBC: Cut in fertility drugs urged

"Learning about Enbridge's poor handling of the rupture, you can't help but think of the Keystone Kops, " Hersman said.

CNN: STORY HIGHLIGHTS