Meso- acromiale, with a small subchondral cyst across the synchdrosis but no bone marrow edema" (my shoulder mri report) plz explain. and solution?

Describes anatomy: MRIs are anatomical tests - you have to infer how the part functions (without the pics, it's hard). A subchondral cyst is an area of sparse bone "beneath the cartilage", i.e, in the bone, which u may have had since birth. Synchondrosis is a joint type, where flat parts of 2 bones touch. Marrow edema refers to inflammation/swelling from trauma. What type of symptoms do you have that led to the MRI?

2-piece bone: The acromium is a small part of your shoulder blade on top of your shoulder. As it forms, 2 parts fuse to make one solid bone. In your case, the 2 parts did not finish fusing. Sometimes that is no problem, other times there is motion at the synchondrosis (place where the two bones are joined by cartilage, rather than bone). You have a cyst there, so you undoubtedly have motion and probably pain.