Figure 4: (a) CD68 staining demonstrates rare intratumoral macrophages in both the high-grade (A) and low-grade (B) components of the primary tumor from the patient A, whereas numerous intratumoral macrophages were present throughout the lung metastases (C) (40x, CD68). (b) (A) Stains for CD68 reveal very few intratumoral macrophages within a primary low-grade chondrosarcoma from the patient B (40x, CD68). (B) CD68 stains of the local recurrence highlight a few macrophages in the adjacent fibroconnective tissue but no intratumoral macrophages (40x, CD68).