I had a neck x-ray today to look for lesions of multiple sclerosis. i wasn't aware they could be seen on an x-ray? can they?

No: Multiple myeloma lesions can be seen on xr, but not ms lesions. See your doctor for clarification.

No: Mri shows the anatomy of the spinal cord tissue. X-ray does not, but may show pathology which may account for symptoms, unrelated to a question of ms.

Specifics: A plain X-ray of the neck cannot visualize MS lesions or even most spinal cord pathology, but an MRI of the neck can find white matter lesions afflicting spinal cord.