Acute longitudinal myelitis is a group of disorder characterized by multifocal, long-segmented inflammation of the spinal cord, rapidly evolving paraparesis, a sensory level on the trunk, and bilateral Babinski signs. We report a case of 30-year-old man with longitudinal myelitis extending to long segment of spinal cord. After 15 days of aggressive treatment with intravenous pulsed methylprednisolone for 5 days, motor and sensory functions of the lower extremities were almost recovered.