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Three‐dimensional imaging of rare mesenchymal tumor of umbilical cord

Mesenchymal umbilical cord tumors are extremely rare but can be detected by ultrasound. The presentation in terms of position, size and echogenicity, as well as the clinical significance, can be variable. We report a case of a tumor at the junction between the umbilical cord and placenta, which was examined using three-dimensional (3D) ultrasound. A 32-year-old patient, gravida 3, para 1, was referred for suspected thrombosis of the umbilical artery at 25 + 6 weeks of gestation. Previous ultrasound examinations during routine screening were normal, showing two umbilical arteries. Further assessment at our center showed a mass at the junction between the placenta and umbilical cord. The inhomogeneous lesion with cystic and solid parts measured 50 × 50 × 52 mm and had minimal blood flow, which was suspicious for a true umbilical cord tumor. In contrast to previous examinations, only a single umbilical artery, with normal flow, was seen. 3D ultrasound was helpful in providing more insight into the details and vascularization of the lesion and the relationship between the tumor vessels and