What is Fibros melanois, not sure of speling

Fibrosis is the formation or development of excess fibrous connective tissue in an organ or tissue as a reparative or reactive process, as opposed to formation of fibrous tissue as a normal constituent of an organ or tissue.

Fibrosing Mediastinitis is 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.