https://www.independent.co.uk/news/health/new-organ-human-body-interstitium-cancer-skin-scientists-discovery-new-york-a8275851.html
Scientists have identified a new human organ hiding in plain sight, in a discovery they hope could help them understand the spread of cancer within the body.
Layers long thought to be dense, connective tissue are actually a series of fluid-filled compartments researchers have termed the “interstitium”.
These compartments are found beneath the skin, as well as lining the gut, lungs, blood vessels and muscles, and join together to form a network supported by a mesh of strong, flexible proteins.
New analysis published in the journal Scientific Reports is the first to identify these spaces collectively as a new organ and try to understand their function.
Remarkably, the interstitium had previously gone unnoticed despite being one of the largest organs in the human body.