FM (Fibrosing Mediastinitis)
What is Fibrosing Mediastinitis:  

A rare benign disorder caused by rapid and repeated growth of acellular collagen
and fibrous tissue within the chest including the central vessels and airways. (1)  
Patients of fibrosing mediastinitis are usually young and can present with symptoms
such as obstruction or compression of the central airways, esophagus, pulmonary
veins or arteries and superior vena cava (SVC).   Fibrosing Mediastinitis can be
either idiopathic (arising spontaneously) or from an abnormal immunologic response
to Histoplasma capsulatum (Histoplasmosis). (2)    
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(1) Rossi, McAdams, Rosado-de-Chrstenson, Franks, and Jeffrey Galvin. (2001).  From the Archives of the AFIP: Fibrosing
Mediastinitis.  RadioGraphics May - June, volume 21.  737-755.

(2)  Kauffman, C.  2003.  Clinical Mycology. Chapter 18: Histoplasmosis. 285- 298. Oxford University Press, Inc.
Helpful Links:
FM Support Group
THE FM FOUNDATION