system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 16-year-old girl presents with episodes of sharp pain in her left upper limb. She says her symptoms gradually onset a few months ago and have progressively worsened. She describes her pain as severe and feeling like “someone stabbing me in my arm and then the pain moves down to my hand”. She says the pain is worse after physical activity and improves with rest. She also says she has some vision problems in her left eye. The patient is afebrile, and her vital signs are within normal limits. On physical examination, there are no visible deformities in the shoulders or upper extremities. Palpation of her left upper limb reveals tenderness mainly near her neck. Mild left-sided ptosis is present. There is anisocoria of her left pupil which measures 1 mm smaller than the right. The right upper limb is normal. A plain radiograph and an MRI are ordered (shown in the image). Which of the following focal neurologic deficits would most likely be seen on the left hand of this patient?
assistant
Numbness over her left little finger