A 48-year-old man died with signs of heart failure. Macroscopy of the heart shows thats the mitral valve cusps are densed, thickened, and moderately deformed. Microscopically the bundles of collagen fibrils are homogenized eosinophilic and surrounded with slight macrophage infiltration, no metachromasia. Picrofuchsin staining reveals yellow foci. Diagnose the type connective tissue damage :