Fig. 2From: Rare case of calcified fibrin sheath causing central venous occlusion, mimicking a retained catheter fragmentContrasted delayed-phase CT venogram in coronal and axial view showing stenosis and non-opacification of bilateral brachiocephalic veins (thin white arrows) near the confluence extending to the upper SVC. The retained calcified sheath (thick white arrows) showed no contrast opacification withinBack to article page