High blood pressure, stress, sun exposure, vein dysfunction, pregnancy, and other factors can contribute to the appearance of veins on the forehead. Genetic factors or age can influence whether ...

The procedure consists of two parts: the insertion and tunneling of the cannula ... although other venous accesses have been used (left internal jugular and, more rarely, subclavian or femoral ...

Inferior venacavography, which must be coupled with retrograde hepatic vein cannulation, allows for demonstration of caval stenosis or occlusion. In many patients with pure hepatic vein thrombosis ...