Complex sentence: Currently is possible to detect lesions before they present demyelination, and they are call pre-active lesions, and a fourth area called DAWM (diffusely abnormal white matter) has been proposed and can help to differentiate PPMS and SPMS.
Split into simpler sentences: Currently is possible to detect lesions before they present demyelination, and they are called pre-active lesions. A fourth area called DAWM (diffusely abnormal white matter) has recently been proposed and can help to differentiate PPMS and SPMS.