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A contact endoscope was used to observe the microhemodynamics of nerve roots before and after retraction of the nerve root during lumbar interbody fusion surgery, and a decrease in the flow rate of erythrocytes was observed.

We experienced a 51 year-old female with high cervical lipoma who complained of neck pain and hypoaesthesia on her right lower extremity. She underwent surgery for removal of the tumour, but she was found unconscious after the surgery and then died after 19 days.

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