I'm sorry to read of the return of your pain and numbness.
Your sentence translates to: "There does seem to be reduced strength of the cerebrospinal fluid signals behind the spinal cord at the levels of the top of the C3 vertebra and the bottom of the C6 vertebra."
The word "seems" makes the sentence speculative and no possibilities are given for the tentative diagnosis. Unless reasons are given elsewhere it may be based solely on your feedback re your pain and numbness.
You probably know that pain and numbness can come from pressure on the spinal cord causing blood-flow restriction. Or from actual spinal cord damage, or both things may be going on. I hope by now you've had more imaging tests to at least find out what's happening, and that some conservative measures can help.
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