It might be helpful to post the actual contents of your MRI report. Did it say "signal in the cord" or "increased signal intensity" or "diminished signal at C5"? Is the cervical cord compressed by a hernia or other condition? The term "signal in the cord at C5" seems incomplete and by itself does not have any meaning. It needs to be considered in the context of the complete MRI result.

"Diminished signal at C5" could indicate that the disk is dry and may indicate disk degeneration.

Increased signal intensity in the cord could indicate cervical compressed myelopathy or a spinal cord lesion.

But, again, no one can really give you an answer without knowing exactly what the entire report says.