Hi junior_physiotherapist,
The title is "peripheral neuritis" but the orthopedist diagnosed as "neck pain radiated to RT.shoulder". I know this isn't a diagnosis at all. But why you said it is peripheral neuritis?
I suppose we need more assessment for this patient as Wikipedia reference-linkMRI to exclude cervical disk prolapse. Also present history may reveal something if the condition starts while he lifted weights or after he waked up in the morning or else. Both side numbness may indicate compression on spinal cord.
You can start with dermatome and myotome in your assessment that will tell you many things.
regards