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Parosteal Osteosarcoma

slide 71 of 91

Comments:
Higher magnification showing hypocellular spindle stroma separating the bony trabeculae. The stromal spindle cells lack cytologic atypia or increased mitotic activity. The vast majority of parosteal osteosarcoma are Grade I tumors; approximately 20% have sufficient atypia to be classified as Grade II.

slide 71 of 91