19th February 2024

A 64-year-old male was referred to the neurology clinic with altered sensation and weakness.

A 64-year-old male was referred to the neurology clinic with altered sensation and weakness. He has reduced sensation along the medial 1.5 digits of his left hand along the palmar surface. Sensation along the dorsal surface is maintained. There is reduced power in abduction and adduction of his fingers, along with impaired thumb adduction. Froment’s sign was positive. Wrist flexion is unaffected. 

Where is the site of the lesion responsible for his symptoms?