Immunohistochemical staining for Vimentin, CD34, CD68 and SMA in myxomas. A: Vimentin was diffusely and strongly reactive with all tumor cells and blood vessels; B: CD34 staining; C: SMA staining; D: CD68 staining; E: negative control. We observed that SMA, CD34 and CD68 were expressed variably in myxomas; F: the surface lining cells were immunoreactive for CD34. (original magnifications: A, B, C, D, E, ×40; F, ×100).