A 37-year-old man with numbness in the hand

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Figure 1:
Positive Froment sign of the right hand.

Box 1: Differential diagnosis of cubital tunnel syndrome

Diagnosis	Differentiating factors
Carpal tunnel syndrome	Sparing of ring and little fingers, thenar muscle wasting, lack of interossei wasting, positive Phalen test and Durkan compression test
Cervical radiculopathy	Neck pain, reduced range of movement in the neck, sensory changes proximal to the wrist crease
Guyon canal syndrome	Sparing of sensation on the dorsum of the hand
Brachial plexus injury or neuritis	History of trauma, more widespread neurologic symptoms and signs
Thoracic outlet syndrome	Pain is a predominant feature; discoloration of the hand; symptoms related to strenuous exercise
Syringomyelia	Widespread neurologic symptoms and examination findings; cape-like loss of pain and temperature sensation
Pancoast tumour	Substantial smoking history; chest pain, breathlessness; hemoptysis; constitutional symptoms of malignancy; Horner syndrome
Less frequent causes include systemic conditions such as Guillain–Barré syndrome, motor neuron disease or polyneuropathy	Bilateral symptoms or unusual patterns of neurologic signs on examination