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- Anonymous8 years agoFavourite answer
The fastest tumors I have seen recur are brain tumors and even they take longer than 2 weeks.
Source(s): I am a cancer registrar. - ?Lv 78 years ago
These things vary. But I have never seen a tumour that recurred within two weeks.
Inflammatory changes may resemble a tumour formation in being lumpy and firm. And they can appear in such a short time frame.
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