The following information was provided by the
California Department of Public Health, Radiologic Health Branch, via email:
On February 28, 2025, the radiation safety officer (RSO) at Keck Hospital of University of Southern California, contacted the Los Angeles County Radiation Management office to report a possible medical event that occurred on February 27, 2025, during a Y-90 Therasphere radioembolization treatment of a liver cancer patient. The RSO indicated that due to abnormally high readings from the waste container associated with one of two dosage vials, he was unable to confirm the dosage administered to the patient. He sent the waste container to the vendor, Boston Scientific, for evaluation, in order to determine the administered dosage.
On March 3, 2025, [the RSO] reported via e-mail that the patient was prescribed a total dose of 1300 Gy, but only 695.5 Gy was delivered during the treatment, which was attributed to the dosage from one of two dosage vials being stuck in the tubing. The underdosage meets the criteria for a reportable medical event. The incident did not cause any harm to the patient. Further analysis will be conducted by Boston Scientific to determine the reason for the dosage being stuck in the tubing.
CA Event Number: 022825
A Medical Event may indicate potential problems in a medical facility's use of radioactive materials. It does not necessarily result in harm to the patient.