Bilateral Mesenchymal Hamartoma of the Chest Wall in a 3-Month-Old Boy: A Case Report and Review of the Literature

Figure 2

Microscopic findings: (a + b) islands of hypercellular cartilage interspersed within mesenchymal-like stroma of spindle cells. (c) Magnified image of the mesenchymal stroma showing mild atypia (arrow head) and mitosis (arrow). (d + e) Magnified image showing focal endochondral ossification (arrow head) and bone trabeculae (arrow). (f) Area of aneurysmal bone cyst formed of hemorrhagic dilated cystic spaces lined by osteoclasts, giant cells, and collagenous tissue.

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