Investigations are under way into how a shipping container full of medical waste and records were dumped in the grounds of the former Magic Kingdom fun park in Sydney's South West.
The container was discovered by fire fighters at the Lansvale property after catching alight.
Police said it was likely the container had been there for a decade.
Professor Steven Boyages from the Sydney West Area Health Service said his he had been informed the container held names and addresses of patients.
“It is a huge concern, I’ve called for an immediate review to ensure our existing contractors are following standard policy and procedures so this doesn't happen again," he said