Cherubism is classified as which type of lesion?

Cherubism is classified as a developmental/hereditary lesion — specifically an autosomal dominant fibro-osseous condition caused by mutations in SH3BP2. It is not reactive (not triggered by inflammation/infection) and not a true neoplasm. It involves bilateral symmetric replacement of jaw bone by fibrous tissue containing giant cells. It appears in early childhood and often regresses spontaneously after puberty. Classification: developmental/genetic.