Giant nontraumatic myositis ossificans in a child: A case report

Figure 4 Intraoperative surgical pictures and gross appearance and microscopic pictures of the tumor. A: The mass is located between muscle spaces and has a complete capsule; B: Specimens of gross appearance, gray–red hard mass, size approximately 14.0 cm × 8.7 cm × 8.2 cm. C: (40 ×) The tumor shows zoning, fibroblast/myofibroblast hyperplasia in the center, inflammatory cell infiltration, and multinucleated giant cell formation, and the surrounding bone trabeculae are arranged in a mesh, and the surrounding osteoblasts are attached.