Your physician is probably suspicious about lung cancer at the top of the lung, cause one of the causes for tingling shoulder is lung cancer that leads to thoracic outlet syndrome.
This syndrome happens when nerves that pass into the arms from the neck have been compressed (conditions that can lead to nerve compression are muscle enlargement, such as from weight lifting and injuries, an extra rib from the neck at birth (cervical rib), weight gain, and tumors at the top of the lung, very rare; often no specific cause is found).
Tingling shoulder can be result of cervical spine conditions, when the nerves are entrapped at their beginning.

Best wishes!
Marija

i have the same thing in my right ling little electic shocks what did you fing out ?