A tumor or abnormal growth that arises from embryonic or primitive tissue cells.
From Greek 'blasto-' (germ, bud) plus '-oma' (tumor), a medical term that emerged in the 1800s to classify cancers arising from immature cells.
The name blastoma hints at cancer's terrible secret: these tumors often grow so aggressively because they arise from young cells that haven't learned to stop dividing yet.
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