Hello! Welcome and thank you for asking on HCM! I understand your concern and would explain that Parkinson disease doesn t seem to be related to your symptoms. Parkinson disease usually starts with symptomatology in the upper limbs and in such a long time it would certainly have an obvious progression. Your symptoms seem to be related to a pinched nerve or a damaged nerve. I would like to know what kind of tests have you performed besides the spinal tap. I recommend performing a nerve conduction study and electromyography of the lower limbs. Further blood lab tests may be needed, depending on the above test results. Hope to have been helpful! Best wishes, Dr. Aida