Evidence of blood vessels in a T. rex fossil is providing scientists with a rare glimpse into how dinosaurs may have healed from injuries millions of years ago. While researchers have long searched for preserved dinosaur DNA, such material rarely survives deep time due to natural decay. As a result, most understanding of these prehistoric animals comes from fossilized bones and teeth, which reveal structure and movement but offer limited insight into internal biology.
In unusual cases, traces of soft tissue — such as skin, pigments, or muscle — have been detected in fossils, helping scientists build a clearer picture of dinosaur life. A new study adds to that growing body of evidence by identifying vessel-like structures preserved inside a Tyrannosaurus rex bone. The findings, published in Scientific Reports, suggest that fragile biological features can endure under specific conditions, providing new opportunities to study dinosaur physiology.
Advanced imaging reveals hidden details
The discovery originated at the University of Regina, where researchers used particle accelerator technology to examine fossilized remains. Through high-resolution 3D imaging, scientists detected structures resembling blood vessels embedded deep within a T. rex bone.
The project later expanded as the research continued at the doctoral level, focusing on how physics-based imaging techniques could uncover microscopic features hidden inside dense fossils. These methods allowed scientists to study internal structures without causing damage, a significant challenge in paleontology.
A fractured rib from a Tyrannosaurus rex is revealing more than just injury—it’s showing how the dinosaur healed.
— Tom Marvolo Riddle (@tom_riddle2025) April 27, 2026
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
The fossil examined belonged to “Scotty,” a well-known T. rex specimen housed at the Royal Saskatchewan Museum and regarded as the largest of its kind ever discovered. Evidence indicates the animal endured multiple injuries during its lifetime, including a fractured rib that shows only partial healing.
Signs of injury point to biological processes
In modern animals, bone injuries trigger increased blood flow to support repair. Researchers believe the structures identified in Scotty’s rib reflect a similar biological response. The team reconstructed a network of mineralized vessels, revealing patterns consistent with healing tissue.
To achieve this level of detail, scientists used synchrotron radiation, a powerful imaging technique that produces intense X-rays capable of penetrating dense fossil material. The analysis showed that the vessel-like structures had been preserved as iron-rich mineral formations. These appeared in layered patterns, suggesting a complex fossilization process influenced by environmental conditions over time.
The partially healed fracture provides a rare glimpse into how large predators may have recovered from injuries millions of years ago. Researchers suggest such findings could help draw comparisons between dinosaurs and modern species, particularly birds, which are considered their closest living relatives.
The study also indicates that fossils showing signs of trauma or disease may be more likely to preserve soft tissues. This insight could guide future excavations and research strategies, helping scientists identify specimens with the greatest potential for revealing biological details.
By integrating advanced physics techniques with traditional paleontology, researchers are uncovering evidence once thought impossible to detect, offering a deeper understanding of how dinosaurs lived, healed, and survived.