Fig. 2.

Primary (A, B, C) and secondary (D) multilobular tumour of bone. Note the dominant presence of multiple lobules containing osteoid tissue (C: left) or cartilage (C: right) and separated by fibrous septa, a feature typical of the multilobular tumour of bone. In marginal areas (C), the lobules were not as well formed and the tumour cells were in places arranged in sheets, features denoting a high-grade malignancy. (D) Metastatic focus in the lungs retaining the multilobular pattern, albeit forming lobules that were smaller and of more uniform size. H&E stain, (A) decalcified section. Scale bars = A: 260 µm, B: 104 µm, C: 52 µm, D: 260 µm.