Yuqiong An^{1, 2}, Yong Liu^1,, Ning Ma^2,

Background: Iliopsoas bursal cystic lesion (IBCL), a rare disease on groin area, posing a significant threat to the lower limb thrombosis, but it is easy to misdiagnose or missed diagnose. Doppler ultrasonography (DU) with certain advantages could be used to detect the enlarged iliopsoas bursa (EIB) and compression of lower extremity vein. Case presentation: A 60-year-old man was admitted to our department complaining of pain and swelling in his right groin area for 3 weeks. DU demonstrated that there was a well-defined, echo-free, cystic mass in the right inguinal region, which severely compressed the common femoral vein (CFV), and the blood flow velocity was extremely slow. Then, surgery was performed to exclude the lesion, consequently, corresponding signs and symptoms had resolved completely. Histopathological results suggested the mass is an iliopsoas bursa filled with mucinous materials. After that, DU was displayed again and the results suggested that the EIB has almost been excised and there was a slight echogenic structure in the deep layer communicating to the hip joint space. Conclusion: Although, IBCL is rare and easy to misdiagnose and missed diagnose, the DU with certain advantages could be used to diagnose effectively this disease and guide the clinical prevention and intervention of thromboembolic events.

doppler ultrasonography, iliopsoas bursa, femoral vein compression