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I would like to know the precise meaning of the word “lésion”. I’ve seen it associated with the word “brain” in some sentences, which led me to think it sometimes means “tumor” but I am not sure.
"lésion" means something going wrong (damage) with any biological tissue causing it not to functional normally. It's used with brain, muscles, skin or any tissue that lives.
“Lésion” generally means “lesion” or ”wound”, but as far as I know, never “tumor”.
“Lésion” can be associated with the word “cerveau” when speaking of “lésion cérébrale”, which means (quite approximately, I’m no doctor) “brain damage”.
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