Proposed approach to the diagnosis of LE and its mimic disorders. Proposed approach to the diagnosis of LE and its mimic disorders. SCLC indicates small cell lung carcinoma; SIADA, syndrome of inappropriate antidiuretic hormone; TPO, thyroperoxidase; NMDA, N-methyl-D-aspartate; STREAT, steroid-responsive encephalopathy associated with autoimmune thyroiditis; AMPAR, α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor. A.J. da Rocha et al. AJNR Am J Neuroradiol 2015;36:2196-2205 ©2015 by American Society of Neuroradiology