1. Methods. A 51-year-old man presented with motor paraparesis (grade 2/5) and hypeesthesia at left L1 and L2 sensory dermatome after a traffic collision.

2. Patients can present with an altered mental state, bradypnea, spastic paraparesis and even a "locked in" syndrome.

3. The clinical presentation included weakness of lower limbs in 17 cases, ambulation dysfunction in 23 cases, paraparesis in 13, pyramidal sign in 13 and urinary incontinence in 5 cases.

4. Methods. A 45-year-old patient who was previously well presented with back pain and rapidly progressive paraparesis.

5. Results All 12 HM patients(100%) had typical clinical features of spastic paraparesis but without sensory dysfunction.