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==Aneurysmal bone cyst== | ==Aneurysmal bone cyst== | ||
===Microscopic description=== | ===Microscopic description=== | ||
The sections show cartilage, bone and osteoid with variable mineralization surrounded by fibroblasts, hemosiderin-laden macrophages, and multi-nucleated giant-cells with | The sections show cartilage, bone and osteoid with variable mineralization surrounded by fibroblasts, hemosiderin-laden macrophages, and multi-nucleated giant-cells with randomly arranged, round nuclei. Hemosiderin-laden macrophages are seen focally. There is no nuclear atypia or mitotic activity. There is no malignant appearing osteoid. | ||
===Final diagnosis=== | ===Final diagnosis=== | ||
Humerous, right proximal, excision - Aneurysmal bone cyst. | Humerous, right proximal, excision - Aneurysmal bone cyst. |
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