(a), NBCCS-OKC, moderate desmin expression around the vessels, ×10; (b), Solitary OKC, caldesmon scattered expression, ×10; (c), Sporadic OKC, focal desmin expression, ×10; (d), NBCCS-OKC, caldesmon in plump fibroblasts in the epithelium and throughout the connective wall, ×10.