What is the underlying cause of focal sclerosing osteomyelitis?

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Caused by excessive formation of periosteal boneCharacterized by severe painResults from a low-grade chronic infectionFrequently occurs after sequestrectomyA type of malignant bone tumor

Explanation

Focal sclerosing osteomyelitis is primarily caused by a persistent, low-grade chronic infection, which leads to localized bone sclerosis. It is not caused by excessive periosteal bone growth, extreme pain, or as a common outcome following sequestrectomy.