Scientists have long searched for dinosaur DNA, but none has been recovered. The genetic material breaks down over time, making it unlikely to survive for millions of years. Instead, researchers rely on fossils to understand how these animals lived. Now, evidence of T. Rex blood vessels preserved inside fossilized bone is offering a rare new window into dinosaur biology.
Most dinosaur knowledge comes from bones and teeth. These structures preserve well and reveal size and movement. But they provide limited insight into appearance and behavior. In rare cases, soft tissues offer more detail. These include traces of muscles, pigments, or skin, such as scales and feathers.
A new study reports evidence of preserved vessel-like structures inside a fossil of Tyrannosaurus rex. The findings, published in Scientific Reports, add to growing evidence that delicate biological structures can survive under certain conditions.
Discovery rooted in physics-based imaging
The discovery began at the University of Regina, where a student joined a research group studying fossils with particle accelerators. Using advanced 3D imaging, the team examined a T. rex bone and identified structures resembling blood vessels.
Years later, the researcher continued this work at the PhD level. The focus remained on applying physics-based methods to improve how fossils are analyzed and to detect fragile structures hidden inside dense bones.
Scotty’s fossil reveals signs of injury and healing
The preserved vessels came from a well-known specimen called Scotty. It is housed at the Royal Saskatchewan Museum and is considered the largest known T. rex ever found.
Evidence suggests the animal lived a difficult life around 66 million years ago. Several bones show injuries. One rib stands out with a large fracture that has only partially healed.
A fractured rib from a Tyrannosaurus rex is revealing more than just injury—it’s showing how the dinosaur healed.
CT scans and thin sections highlight zones of bone regrowth and mineralized vessel-like structures, offering rare insight into ancient healing processes. pic.twitter.com/C6V3Fz4Ct6
— Tom Marvolo Riddle (@tom_riddle2025) April 27, 2026
In living animals, injured bones trigger increased blood flow to support repair. The structures found in Scotty’s rib appear to reflect this response. Researchers identified a dense network of mineralized vessels and reconstructed them using detailed 3D models.
Advanced imaging reveals hidden structures
Studying the inside of fossil bones is difficult. Scientists must avoid damaging the specimen, and fossils are extremely dense due to mineral replacement over time. Standard CT scan methods often cannot penetrate large fossils.
To address this, researchers used synchrotron radiation. This method produces high-intensity X-rays at specialized facilities. It allowed the team to see tiny internal features with high clarity.
The analysis showed the vessels were preserved as iron-rich mineral casts. They appeared in two distinct layers, suggesting a complex fossilization process shaped by environmental conditions.
Findings may guide future fossil research
The partially healed fracture offers a rare opportunity to study how a large predator recovered from injury. Researchers say the findings may help compare dinosaurs with modern animals, especially birds, their closest living relatives.
The study also suggests that bones showing signs of injury or disease may be more likely to preserve soft tissues. This could help scientists identify promising fossils for future research.
By combining physics and paleontology, researchers are uncovering new details about dinosaur biology once thought beyond reach.
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