Low IgM might be a serious problem or can be a benign condition. In order to define what it is in your particular case, many other factors should be considered: your age, history of any diseases or conditions you had, quantity of other imuunoglobulins in the blood etc.Ejection fraction
and Fract short are the same.
Intervertebral disk herniations/protrusions can get well spontaneously (i.e. by itself without any treatment). According to the statistics, about 25% of these disk problems get well without treatment.
Hope this helped.