Retained lipiodized oil misdiagnosed as residual metallic material.

Retained foreign material is one of the most common issues in medical malpractice lawsuits. We report here a case in which an extremely high-density material was found within the pelvis, which proved to be harmless residual lipiodized oil. Although there have been reports of lipiodized oil being retained within the fallopian tube for more than 25 years, to our knowledge there have been no previous reports of lipiodized oil retention in areas other than the genital tract.