residual abscess

re·sid·u·al ab·scess

an abscess recurring at the site of a former abscess; results from persistence of microbes and pus.

re·sid·u·al ab·scess

(rē-zid'yū-ăl ab'ses)
An abscess recurring at the site of a former abscess resulting from persistence of microbes and pus.
References in periodicals archive ?
The first postoperative MRI showed a small residual abscess, which was no longer visible on a control image.