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(a) The illustration of the midsagittal image shows that the landmark of the brainstem vertical line is the perpendicular line (blue dotted line) to the posterior border of the brainstem (red dotted line). (b) The slice parallel to the anterior commissure-posterior commissure line (dotted line) includes both the pons (*) and the medulla oblongata (**). Therefore, the diagnosis about the location of a lesion tends to be misunderstood.
