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Figure 4: (a) Fine-needle aspiration cytology of osteoblastoma showed osteoblasts with perinuclear hof (inset) and cells showing uniform fine chromatin with inconspicuous nucleoli (thin arrow). Atypical mitosis is not seen (May-Grunwald-Giemsa, ×40; H and E, ×40). (b) Fine-needle aspiration cytology of osteosarcoma showed cellular smears comprising round-to-spindle cells with moderate-to-severe pleomorphism and nucleus with coarse chromatin and prominent nucleoli (thick arrow). Mitotic figures are present (H and E, ×40) (This figure of osteosarcoma is original and is from another case. It is shown for comparison with osteoblastoma and has no relation with the present case)

Figure 4: (a) Fine-needle aspiration cytology of osteoblastoma showed osteoblasts with perinuclear hof (inset) and cells showing uniform fine chromatin with inconspicuous nucleoli (thin arrow). Atypical mitosis is not seen (May-Grunwald-Giemsa, ×40; H and E, ×40). (b) Fine-needle aspiration cytology of osteosarcoma showed cellular smears comprising round-to-spindle cells with moderate-to-severe pleomorphism and nucleus with coarse chromatin and prominent nucleoli (thick arrow). Mitotic figures are present (H and E, ×40) (This figure of osteosarcoma is original and is from another case. It is shown for comparison with osteoblastoma and has no relation with the present case)