Over the holidays, it was announced that an exam using an MRI can now detect the differences between Alzheimer's and frontotemporal lobar degeneration. The two disorders show similar symptoms. However, using the MRI successfully to differentiate between these two possibilities is a non-invasive technique which is easier on the individual going through the diagnostic process than being subjected to a lumbar puncture.
Is it Alzheimer's or Another Dementia? MRI Scan can tell
Can MRI Screen for CSF Biomarkers in neurodegenerative disease? (Abstract)