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This is Dr. David
i would get a copy of this CT scan and report.
there could be some old blood causing calcifications in the uterus which can cause brightness on a CT scan which can look like an IUD
you might need a uterine transvaginal ultrasound which can look at the uterus more directly and confirm if you really have an IUD still in there or just old blood and calcifications.
did your doctor set you up for a transvaginal ultrasound of the uterus?