I am not familiar with the use of the term "polyp" on the lung to describe anything that would show up on a chest x-ray. Polyps are found in the nose or voice box. These are fleshy growths of the lining of the nose and sinuses or the vocal cords.
An abscess is a very different problem. It is a collection of pus. Shadows on chest x-rays can resemble abscesses. These can be non-cancerous or cancerous. Your mother will need to see a doctor to learn more specifics about these abscesses. The lung specialist that she saw on Monday 12 May 2003 is the type of specialist to answer your questions, determine the most helpful testing and the best treatment for your mother.