Suprahilar mass is a mass that is above the lung hilum. The location does not say anything about the mass. It can be benign or cancer. A CT scan will confirm the location and size of the mass and a biopsy will most likely be done to check it. The cardiac impression on the lung is called the hilum. This is where the root of the lung enter and leave the viscus. The pulmonary ligament droops down from the hilum and ends in a free edge.