This bone disease develops in adults and most often in older people. It is characterized by the formation of isolated areas of large fibrous growths in the form of plates and cords, between which there remains a narrow, greatly expanded bone marrow cavity with a surface covered with osteophytes (bone spines). The formation of large synovial cysts is possible, the cartilaginous ruptures of which lead to a narrowing of the bone marrow cavity and the formation of a hippocrasian nodule or fistula. The number of such nodes can reach three, four or more. Growing in wide bones (