microscopic observations suggested the following features to be typical of fibroma of the tendon sheath : primitive mesenchymal or fibroblastic cells without further differentiation , slit- and cleft-like spaces with lining cells decorated by endothelial markers , and collagenous , cartilaginous or myxoid basic substance at least in areas rich with sulphated glycosaminoglycans .
C1275236
of fibroma
C0016030
fibroblastic