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Osteosclerosis was observed in the tibia and sternum in F344/DuCrj rats of both sexes at 6, 18 and 30 months of age. The lesion first seen was a proliferation of osteogenic tissues on the marrow surface of the cortical bone and bone trabeculae, resulting in replacement of the marrow cavity by lamellar bone. Most of the affected rats had associated degenerative osteoarthrosis and regressive changes of the growth plate. Osteosclerosis was considered to be an aging change, lesions were observed at 6 months and increased in frequency with age.
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