My sis was diagnosis with ms in her back only, i thought that affected the whole body. how will this affect her since we don't understand the disease?

SPINAL CORD: Some folks have only lesions noted in the spinal cord, and lack lesions in brain. In this case, leg weakness, numbness, and maybe bowel or bladder problems might ensue, but please question the diagnosis, as she might possess neuromyelitis optica, and an nmo antibody study might assist. If it is indeed ms, please start potent disease modifying agent to control inflammation.