(M1.MK.13.8)
A 37-year old female presents with "clumsy" hands and clawing of her 4th and 5th finger that has been progressively worsening over the past year. On physical exam, she has decreased pinch strength and paresthesias over her 5th finger. A clinical photograph is shown in Figure A. Which of the following best explains her condition?
QID:
101945