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A 24-year-old male presents with increasing knee pain over the last 6 months. He reports that he sustained a non-contact twisting injury to the knee 7 months ago while playing softball. His knee range of motion is full and his knee is stable to varus and valgus at 0 and 30 degrees of knee flexion. There is a grade 1 Lachman examination. His dial test reveals 30 degrees of external rotation at 30 degrees of knee flexion. A radiograph is shown in Figure A. A biopsy is performed and is shown in Figure B. What is the most appropriate definitive management?
Reassurance and observation in 6 months with repeat knee radiographs
Neoadjuvant external beam radiation, wide surgical resection, and adjuvant chemotherapy
Wide surgical resection
Neoadjuvant chemotherapy, wide surgical resection, adjuvant chemotherapy
Neoadjuvant chemotherapy, marginal surgical resection, adjuvant chemotherapy
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A 21-year-old male presents with increasing shoulder pain for the past 6 months. Radiograph, CT scan, bone scan, MRI, and histology slide are shown in Figures A through E. What is the most appropriate diagnosis?