Disease may be truly idiopathic (dogs and cats) or may be secondary to another disease process, often chronic inflammation or neoplasia. Chronic antigenic stimulation induces the overproduction of AA protein which may become deposited throughout the body. | Disease may be truly idiopathic (dogs and cats) or may be secondary to another disease process, often chronic inflammation or neoplasia. Chronic antigenic stimulation induces the overproduction of AA protein which may become deposited throughout the body. |