From limited information of a pain diagram, which diagnosis can be ruled out?

From limited information of a pain diagram, which diagnosis can be ruled out?

• A. Brachial plexus neuritis
• B. C7 disc herniation
• C. Cubital tunnel syndrome
• D. Pancoast tumor

Answer: (C)

Interpreting a pain diagram relies on matching pain locations to nerve or root patterns. Cubital tunnel syndrome is an entrapment of the ulnar nerve at the elbow, so its typical pain and sensory changes run along the ulnar side of the forearm and hand (toward the little finger and ring finger), often with elbow-localized pain. If the diagram shows pain that does not involve the elbow region or the ulnar hand distribution, that pattern does not fit cubital tunnel syndrome, making it unlikely with the limited information provided. The other conditions can present with shoulder and arm pain that could be captured by a general diagram of the upper limb, so they remain plausible. Hence, the pattern on the diagram allows cubital tunnel syndrome to be ruled out.

Interpreting a pain diagram relies on matching pain locations to nerve or root patterns. Cubital tunnel syndrome is an entrapment of the ulnar nerve at the elbow, so its typical pain and sensory changes run along the ulnar side of the forearm and hand (toward the little finger and ring finger), often with elbow-localized pain. If the diagram shows pain that does not involve the elbow region or the ulnar hand distribution, that pattern does not fit cubital tunnel syndrome, making it unlikely with the limited information provided. The other conditions can present with shoulder and arm pain that could be captured by a general diagram of the upper limb, so they remain plausible. Hence, the pattern on the diagram allows cubital tunnel syndrome to be ruled out.