1. Displaced disc material that is not contained by uninterrupted outer anulus. 

2. (Non-Standard) [A disc in which a substantial portion of the displaced
portion of the disc is outside of disc tissues.] 

3. (NonStandard) [A disc in which a displaced portion is wholly
outside of disc tissues]. 

4. (Non-Standard) [A disc in
which a displaced fragment is not contained within disc
tissues, ligament, or membrane].