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 3-year-old boy is brought to the physician because of arm pain following a fall that took place 5 hours ago. According to his mother, the boy was running in the yard when he fell and injured his right arm. The boy is crying and clutching his arm. During the past year, he has been brought in 4 other times for extremity pain following falls, all of which have been diagnosed as long bone fractures. He is at the 10th percentile for height and 25th percentile for weight. His temperature is 37.3°C (99.1°F), pulse is 95/min, respirations are 21/min, and blood pressure is 97/68 mm Hg. His right forearm is diffusely erythematous. The patient withdraws and yells when his forearm is touched. His left arm has two small ecchymotic regions overlying the elbow and wrist. A photograph of his face is shown. An x-ray of the right forearm shows a transverse mid-ulnar fracture with diffusely decreased bone density. Which of the following is the most likely cause of this patient's symptoms?
assistant
Type 1 collagen defect
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