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Phleboliths mistaken for intraperitoneal copper-containing intrauterine device in the presence of missing strings

Although rare, pelvic phleboliths may confound the diagnosis of an intraperitoneal or malpositioned intrauterine device (IUD). Pelvic phleboliths are focal calcifications in pelvic veins, often in multiples near the ureters, occurring in about 40% of adult patients. We treated a 35-year-old woman requesting removal of her copper-containing IUD (TCu380A IUD). She had missing IUD strings on clinical examination. A clinic-based transvaginal ultrasound and anteroposterior abdominal radiograph that followed suggested prior TCu380A IUD expulsion. A radiologist later interpreted several ambiguous radiodensities in the abdominal radiograph as a possible intraperitoneal or malpositioned IUD. In collaboration with radiologists and family planning specialists, it was suggested that the patient further undergo a three-dimensional ultrasonography and a CT of the pelvis. The radiodensities first noted on the radiograph were revealed to be phleboliths, a diagnostic possibility not initially considered by any of the primary clinical care team, radiologists or family planning specialists.