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“Flip-flop sign” and “Candle guttering appearance” of syphilic meningomyelitis “Flip-flop sign”: high-signal intensity of the thoracic spinal cord parenchyma except T6-7 level (A), and abnormally enhanced parenchyma were observed at this T2WI-low-signal area (B). “Candle guttering appearance”: peripheral strip-like enhancement from the surface of the spinal cord in T10 level.
