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 14-year-old girl is brought to the physician because of a 1-week history of malaise and chest pain. Three weeks ago, she had a sore throat that resolved without treatment. Her temperature is 38.7°C (101.7°F). Examination shows several subcutaneous nodules on her elbows and wrist bilaterally and a new-onset early systolic murmur best heard at the apex in the left lateral position. An endomysial biopsy is most likely to show which of the following?
assistant
Fibrinoid necrosis with histiocytic infiltrate