Michele, I had similar symptoms last year and a dye study showed that part of the catheter had broken off. Whether this was caused by a clot or from friction, from the catheter being pinched against the collarbone, we don't know; but they removed the catheter fragment and port and replaced it with a new one. It's good they're taking your symptoms seriously and checking your port with the dye study, just be sure they have checked to make sure all of the catheter is still attached to the port.
Love, Lolly
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