Since the dawn of time, we have been dissecting bodies. Medical science owes many of its greatest breakthroughs to people who have donated their bodies for research after they have died, and, in some cases, had their remains taken without their consent by body snatchers.

Now that we live in an age of space exploration, it’s hard to believe that there’s anything about the physicality of the human body that we don’t know. After all, millions of corpses have been dissected, but it turns out that an organ went completely unidentified until now.

The news report below provides the lowdown on this remarkable discovery:

So what is this mysterious organ that literally thousands of doctors haven’t noticed? Well, it’s one of the biggest in the human body (yes, we’re completely serious), and its discovery could have massive implications when it comes to the treatment and prevention of cancer.

The organ in question is called the interstitium. In a study which was published today in the journal Scientific Report, it was revealed that the interstitium is a network of fluid-filled tubes which exist all around the body. What’s more is that it could work as a shock absorber.

The fact that the interstitium is so large, however, could explain why cancerous cells are able to spread from organ to organ. This knowledge is something which scientists could use to save lives once they understand more about how the interstitium works.

As it stands, one in two people will develop cancer at some point in their lifetime, so it has colossal implications for humanity as a whole.