Venous adventitial cystic disease is a very rare disease that can cause deep vein thrombosis: A case report

Figure 1 Image study. A: Venography showing a mass-like lesion (scimitar sign) outside the blood vessel pressing on the right common femoral vein (FV) (CFV) (arrow); B: The cystic mass pressing on the right CFV (arrow); C and D: On ultrasonography, flow to the right FV cannot be observed because of a cystic mass blocking the right CFV; C: Transverse view; D: Longitudinal view. Arrows point to the cyst.