Migrated intrauterine contraceptive device - Lippes Loop
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Right loin pain and hematuria
A radiopaque serpiginous device in the pelvis.
Right vesicoureteric junction stone averaging 5 mm in diameter with mean density 600 HU with minimally dilated right ureter.
Incidental finding of a radiopaque serpiginous device in the posterior pelvis, that is located posterior and to the left to the uterus.
Lippes Loop intrauterine contraceptive device was made by Jack Lippes in 1960 that had a "Double-S" shape. It is a flexible polyethylene plastic loop that was used for long-term contraception until menopause. Its use was discontinued in 1985. Still, we could see this loop in radiological examinations in old women.
In this case, the loop isn't seen at the uterine cavity location. Instead, it is located posterior and to the left to the uterus and behind left adnexa indicating a migrated loop.