Scarring vs plaque vs hardening

[M77]

If you injure yourself which results in scarring does it mean you have more plaque build up? What about if the valves feel as though they are "hardening" would this also be considered plaque?

Does anyone know how you would differentiate these or if these are all the same?  

[AlterEgo]

It could be corporal veno-occlusive dysfunction and scarring in there