Autoimmune disorders occur when the immune system inadvertently attacks the body's own cells.
Other types of benign tumors include fibromas, bronchial adenomas, hemangiomas, and blastomas. The most common are tissue malformations called hamartomas. Benign tumors can also develop in the lungs.This can sometimes be seen as a spot on an X-ray. Like all lymph nodes, they can become enlarged during infection. Mediastinal lymph nodes are located along the lining of the lung.
