Does low IgM low has any serious concerns? Does Ejection Fraction and Fract Short mentioned in Echocardiography report are same? Does C5-6,C4-5, C6-7 goes corrected at their own after 6-7 months, these shown as moderate to severe changes in MRI ,after 6-7 months EMG done ,this shows no changes on these C levels, how come this happen? Does this is possible OR any of EMG // MRI are wrong?