Brain stem lesions on MR images and abnormal respiration. Brain stem lesions on MR images and abnormal respiration. Patient numbers correspond to those in Table 1. L indicates lower brain stem lesion; U, upper brain stem lesion; BG, basal ganglia lesion; WM, cerebral white matter lesion; solid line, duration of the disease; solid circle, acute respiratory failure; dotted line, permanent mechanical ventilation; cross, death Junko Arii, and Yuzo Tanabe AJNR Am J Neuroradiol 2000;21:1502-1509 ©2000 by American Society of Neuroradiology