Macroscopically, an osteoid osteoma is smaller than 1 cm and is a well circumscribed, red mass - likened to a cherry.
Microscopically, there is bone and osteoid arranged into trabeculae with no organised pattern of growth. The intertrabecular tissue is very vascular, with spindle cells and fibroblasts.
There are many large osteoblasts with occasional osteoclasts.
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