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Figure 3: Ultrasound-guided core biopsy of the fibular head mass showing poorly differentiated carcinoma. Note: (a) Low power view showing poorly differentiated carcinoma. (b) High power view showing poorly differentiated carcinoma with rare glandular formation. (c) Immunohistochemical stains showed the tumor cells are positive for cytokeratin 7. (d) Fibular head mass immunostained negative for cytokeratin 20. The above findings are consistent with metastatic adenocarcinoma of lung primary. Original magnification: a, × 100; b–d, × 400. |
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