Meeting Abstracts from the British Society of Breast Radiology annual scientific meeting 2023

26(1):O1The COVID-19 pandemic led to recommendations for decreased or ceased breast screening services.Prior studies that examine the COVID-19 impact on mammography volumes are limited to single regions and rates of less than 9 months post-pandemic.This study aims to assess the recovery of screening mammography volumes from 3 months pre COVID-onset through 12 months post COVID-onset across 7 participating sites from four countries.We collected mammography volume data from 7 breast screening services (Canada, Germany, USA, UK) between December 2019 and April 2021 using an artificial intelligence software tool.The study was approved by the research ethics at participating sites.249,817 screening mammograms were collected.Of the 7 participating sites, 4 returned to and occasionally exceeded pre-COVID volumes, whereas the other 3 sites approached but did not fully return to pre-COVID volumes in the 12 months post COVID.Sites varied substantially in the time taken to re-initiate screening mammography after the first COVID wave (1-6 months).One site shut down screening services in successive COVID waves, while other sites experienced short dips in volumes but generally recovered within one month.In the 1-year period post COVID-onset, mammography screening volumes recovered to varying extents at differing rates, with some sites returning to pre-pandemic levels and others lagging behind.This international multi-center study may inform future opportunities for collaboration between sites to develop strategies for increasing screening volumes and sharing best practices for pandemic recovery.