How a Utah zoo team CT scanned a 400-pound crocodile: full analysis

Utah’s Hogle Zoo has turned an unusual diagnostic challenge into a case study in modern zoological medicine: getting a CT scan on Bill, a 61-year-old Siamese crocodile weighing nearly 400 pounds. According to University of Utah Health’s April 24, 2026 report, Bill was scanned after months of decreased appetite, weight loss, and abdominal bloating that hadn’t been explained by bloodwork. The imaging found multiple stomach stones and ruled out cancer, giving his care team clearer footing for next-step decisions. (healthcare.utah.edu)

The case grew out of health changes first observed in 2025, when Bill’s keepers and veterinary team began closer monitoring. What followed was less a single procedure than a coordinated logistics exercise: more than 20 zoo staff members helped restrain and transport the animal, a mild sedative was used under veterinary supervision, and a custom platform supported him during transfer to University of Utah Health. Fox 13’s local report underscored the scale of the effort and the emphasis on safe handling for both staff and patient. (healthcare.utah.edu)

Once Bill reached the scanner, the radiology team had to adapt human equipment to a reptile patient that exceeded the CT table’s working length. University of Utah Health said the team scanned him in stages, flipping him to capture the full body, and manually set radiation dose parameters because automated human presets weren’t appropriate for an animal with much thicker, armored skin. That operational detail is notable: the story isn’t just that a crocodile got a CT, but that diagnostic imaging staff and zoo clinicians built a species-specific workflow in real time. (healthcare.utah.edu)

The imaging findings were clinically nuanced. Bill’s CT showed several gastric stones, and crocodiles do normally swallow stones as part of digestion. That means the result wasn’t a simple foreign-body emergency, but a more complicated question of whether a normal species behavior had become pathologic in an older animal with compatible signs. University of Utah Health reported no evidence of cancer, and said Bill has since shown less bloating, improved appetite, and more energy after returning to the zoo. (healthcare.utah.edu)

There’s also a conservation backdrop. Siamese crocodiles are widely recognized as critically endangered, and Hogle Zoo is one of a small number of U.S. institutions housing the species. That makes geriatric care decisions more than a one-off clinical anecdote; they sit within the broader responsibilities of accredited zoos managing long-lived, conservation-relevant reptiles under rigorous animal care standards. (nc.iucnredlist.org)

Expert commentary in the source material centered on both imaging difficulty and collaborative problem-solving. Erika Crook, DVM, Dipl. ACZM, Hogle Zoo’s director of animal health, said crocodiles’ heavy scales make routine diagnostics difficult and that the team needed a CT unit capable of handling Bill’s size. University of Utah radiology staff described the case as technically unusual but feasible with planning, while Meredith Salinas, Hogle Zoo’s animal care supervisor in herpetology, emphasized the importance of coordinated handling. Outside this specific case, zoological imaging resources such as the Zoo and Aquarium Radiology Database and recent crocodilian imaging literature point to a growing push for standardized protocols that reduce handling time and improve diagnostic validity. (healthcare.utah.edu)

Why it matters: For veterinary professionals, Bill’s case illustrates where exotic and zoological medicine are heading: more use of referral-level imaging, more collaboration between zoo teams and human health systems, and more emphasis on balancing diagnostic yield against transport, restraint, sedation, and intervention risks. It also shows the limits of relying on routine lab work alone in reptile patients. In practice, the lesson is that advanced imaging may be most useful not when it produces a dramatic diagnosis, but when it narrows uncertainty enough to support a defensible quality-of-life plan. (healthcare.utah.edu)

What to watch: Hogle Zoo said its team is now weighing whether stone removal would offer more benefit than burden for an aging crocodile, so the next phase will likely be careful monitoring, reassessment of clinical signs, and a decision on whether conservative management or intervention best supports Bill’s welfare. (healthcare.utah.edu)