Style error: Radiology
The Radiology style has an error in the way author names are handled. For seven or more authors, the list should be truncated to three followed by "et al." In addition, the publication month abbreviation should not be included after the year.
http://pubs.rsna.org/page/radiology/pia#References
http://pubs.rsna.org/page/radiology/pia#References
Styles also update automatically within 24hs for Zotero 4.0+
In an existing document, you may have to switch to a different style and back for the changes to take effect once the style is updated.
Any further problems please let us know & thanks for reporting