http://www.uwmedicine.org/health-library/pages/chest-port.aspx
What is a chest port?
Your doctor has asked us to insert a chest port (port-a-cath) in your body. This device is a catheter (long plastic tube) that is connected to a plastic and metal reservoir (see the picture below).
An interventional radiologist will place the port in your chest. This provider is a doctor or a physician assistant with special training in doing this kind of procedure.
When the catheter is placed in your chest, the catheter tip will be in the large vein that empties into your heart. The port itself will be funder the skin of your chest, below your collarbone and above your breast area.
You will have a thin scar 1 to 2 inches long on your skin. You will not be able to see the port and catheter. But, you may have a small bulge in your skin where the port is.