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What does distinct lesion mean?

Hi. I got diagnosed with a bone tumour which had been cut out. I spoke to my doctor today and he told me that my tumour was benign but mentioned that the lesion was distinct and that I'll be monitored in the future.What did he mean by that? I'd be grateful for any explanation.
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Avatar universal
Your doctor was probably referring to the border of the bone lesion with adjacent normal bone. A distinct, well-defined lesion with narrow zone of transition favors a nonaggressive or benign process, whereas an indistinct, ill-defined lesion with wide zone of transition favors an aggressive or malignant process.
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