Way back in 2009–over a decade ago, now!–I blogged about the above photo, which I stole from this post by ReBecca Hunt-Foster. It's a cut and polished chunk of a pneumatic sauropod vertebra in the collections at Dinosaur Journey in Fruita, Colorado. This is the other side of that same cut;
Matt Wedel (Mon,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: