Well, that just sucks. I only got to enjoy remission for a few months. Last July I was diagnosed with stage IV pancreatic cancer (2" tumor in the pancreas & at least 18 in the liver). Within 8 months I was tumor free.
I underwent radiosurgery to the pancreas to kill off any hiding cells.
Last Friday I went in for a CT scan and learned they saw two new small spots in the liver. My oncologist ordered an MRI and biopsy to see what we're dealing with, and if the cancer has mutated, but I spent the week fighting the insurance company to pay for an MRI. The spots are so small and the CT scan fuzzy enough that the surgeon doesn't feel comfortable performing the biopsy, this the reason for the MRI and its clearer imags.
My oncologist had a peer to peer meeting with the insurance company this morning and was able to push the MRI through. I go in Friday morning and hopefully will have the biopsy soon after.

Sigh...I was really enjoying remission.

(BTW, I still feel great, and I'm still working 40 hour weeks. I told my husband, "I'm not ready to return to pain meds and debilitating exhaustion." I really hope the MRI shows nothing or the biopsy reveals no cancer.)