Foreign Body

This is a plain abdominal X-ray of an 85-year old lady who has undergone an extensive, fully modern evaluation for iron-deficient anemia. The object circled in yellow in the left pelvis was read as an "unknown metallic object likely on the abdominal wall; clinical correlation needed." Her past history is significant for TAH/BSO and radiation therapy in the 50's for cervical cancer, a lap chole about 6 years ago, and arthritis (not on NSAIDs). Anyone want to guess at the nature of the radiographic finding? I'll post the answer on Wednesday.