A midline disc protrusion, also called central disc protrusion, usually occurs at the lower back and is mostly painful, since it typically impinges the nerve root directly. The technical word midline is used to specify the position of the protrusion in relation to the disc.
appeal. 1  a call upon some authority or person for a decision, opinion, etc. 2  an urgent request for help, sympathy, etc. 3  a quality in a person or thing that arouses interest, sympathy, desire, etc.; attraction. 4  Obs. an accusation. 5  Law the submission of a lower court's ruling, verdict, etc. to a higher court for review. a request for this.
The key difference between an appeal and a campaign is that an appeal has a set target which is needed to achieve the desired result (e.g. buying the minibus, or building an extension); a campaign is simply to raise as many funds as possible towards a specific focus (so the more you raise, the more you can do in that area of your work).