Carpel Tunnel Ulnar Nerve Entrapment
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starting with your left hand which could sound like an entrapment of the Ulnar nerve at the Guyon canal (in the wrist) except for the
1- numbness of the middle finger which is from the median nerve (a completely dfferent path/root of the brachial plexus)
2- Atrophy of the thumb extensor muscle, which is from the radial nerve(a partially different path of the Plexus)
3- having no pain and even no parathesia (pins and needles)as they indicate irritation of the nerve while numbness and atrophy more with heridiary problems
So you are beyond the ulnar nerve only from your history, and as you have numbness, that will eliminate some serious diseases of the spinal cord.
What should be ruled out
1- Thoracic outlet syndrom by a routine chest xray
2-Any compression of the lower part of the brachial pleaus(the gathering of the nerves in the neck)by a proper c-xray and MRI
3-At the same time look for a syrinx in the spine
4- Its less likely to be a root problem (the nerve coming out of the spine) in the lower part of the neck
About the rt hand, what you mentioned is not enough to point at CTS. We need to know more as does it wake you up from asleep, do u have to shake the hand to relieve the pain, what other situation could bring up the pain ..ext
But putting the entire detailes together it could be a one disease with liability of involving several nerves (those at a compression site)
In brief, you should be seen by a neurologist who is specialized in peripheral nerves diseas to put all these peaces together for localizing to the best or highest anatomical site
Bob
Thanks, RSR