The tumor ate into my arm and now my arm is just a rocky tumor that looks like an arm.
The tumor fused with my arm and now my arm is just a rocky tumor that looks like an arm.
Not sure if ate into is the right expression. I want to say that the arm is full of tumor and not that the arm fell off or something along that line.
"Ate into" implies that some tissue from your arm was removed, "eaten" by the tumor. That seems more in line with the rest of the sentence, "just a tumor that looks like an arm", which also sounds like there is little original arm tissue left.
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"Ate into" implies that some tissue from your arm was removed, "eaten" by the tumor. That seems more in line with the rest of the sentence, "just a tumor that looks like an arm", which also sounds like there is little original arm tissue left.