What are the symptoms of fibrosing mediastinitis (fm)?

Several or none: Early stages may have no symptoms at all. As the fibrosis progresses, symptoms develop based on the structure involved. More commonly the superior vena cava is compressed and can lead to engorged neck veins, head and/or arm swelling and headaches. If the trachea or main bronchi are compressed there may be difficulty breathing. If the esophagus is compressed, then there is difficulty swallowing.