34 yrs old C/O upper limb weakness with past Hx of burning her | sᴘᴏᴛ ᴅɪᴀɢɴᴏsɪs
34 yrs old C/O upper limb weakness with past Hx of burning her hands without noticing otherwise Hx unremarkable o/Ex power 2/5,loss protopathic sensation in arms, neck and back, intact epicritic sensation and coordination. What's the underlying pathology: