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This is Dr. David
it sounds like that intradural extramedullary lesion at T5-7 is damaging your spinal cord and causing numbness from your chest and toes and causing you to loose strengthen in your legs.
you need to see a neurosurgeon about that intradural extrabeduallary lesion
you might need a biopsy of the lesion
if it is a glioma, you might need radiation therapy to the area to kill it or shrink it to help your neurological symptoms.
do you have a soon appointment to see a neurosurgeon?