Hi i have a very large cyst at c7, on a cross section of the mri it is nearly as large as my spinal column, is this dangerous, yes from time to time i have numbness in both my hands but i do also have disk pressing on my spinal cord in the cervical area, is this cyst dangerous, i understand from reading they are filled with cfs, how are they so sure of this without testing? what causes them? what if it ruptures, and what kind of dr should i see