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Interstitium, Derived From Interstitial–The Space Between And Within Tissues All Over The Body, And Containing Fluid, Is Being Classified As An Organ By Scientists. And This Newly Defined Organ, Interstitium, According To Scientists, May Be The Biggest In The Human Body.

Newfound 'organ' could be the biggest in your body – CNN

https://www.cnn.com/2018/03/27/health/new-organ-interstitium-study/index.html

Researchers have detailed the structure and distribution of spaces in your body that they say represent a newfound human organ.