A large tumour nodule arising from the 4th lumbar vertebra of a strain 2/N guineapig was observed: no metastases were detected. The other guineapig (strain 13/N) had multiple tumour masses, with lesions of osteogenic sarcoma in the lumbar vertebrae, pancreas, liver, stomach, lungs, kidneys and testis. The original site of the tumour was thought to be the upper lumbar vertebrae.
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