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The Brissaud sign.

A 65-year-old man has a three-month history of lumbar back pain and progressive lower extremity weakness due a T6 spinal cord compression secondary to hepatic metastatic carcinoma. Examination revealed, paraplegia, urinary incontinence, T10 sensory level, lower limbs hyperactive deep reflex, and hallux indifferent cutaneous plantar response but with an exuberant fascia lata reflex (Figure). The Brissaud sign, a succedaneum published only 22 days after Babinski’s famous lecture, is a twitch in the lateral portion of the quadriceps muscle on tickling the sole of the foot and represents a proximal component of the flexion reflex synergy owing to pyramidal tract disfunction.