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 45-year-old man comes to the physician for the evaluation of limited mobility of his right hand for 1 year. The patient states he has had difficulty actively extending his right 4th and 5th fingers, and despite stretching exercises, his symptoms have progressed. He has type 2 diabetes mellitus. He has been working as a mason for over 20 years. His father had similar symptoms and was treated surgically. The patient has smoked one pack of cigarettes daily for 25 years and drinks 2–3 beers every day after work. His only medication is metformin. Vital signs are within normal limits. Physical examination shows skin puckering near the proximal flexor crease. There are several painless palmar nodules adjacent to the distal palmar crease. Active and passive extension of the 4th and 5th digits of the right hand is limited. Which of the following is the most likely underlying mechanism of this patient's symptoms?
assistant
Palmar fibromatosis