The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 65-year-old man presents with pain in his left thigh for a week. He describes the pain as dull and constant, boring in nature, and localized deep below the thigh muscle. He says it is worse at night. Physical examination is significant for tenderness and warmth over the anterior aspect of the left thigh. A plain radiograph of the left femur shows increased cortical thickness with widened intercortical space. Laboratory studies show: Alkaline phosphatase 925 U/L Serum calcium 9.2 mg/dL Serum phosphorus 4.4 mg/dL Findings on bone biopsy are shown in the image. Which of the following is the most likely diagnosis in this patient?   (A) Ewing's sarcoma   (B) Osteitis deformans   (C) Osteochondritis dissecans   (D) Osteitis fibrosa cystica
['(B) Osteitis deformans <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', "(A) Ewing's sarcoma \n (B) Osteitis deformans \n (C) Osteochondritis dissecans \n (D) Osteitis fibrosa cystica <> possible answers", '  A 65-year-old man presents with pain in his left thigh for a week. He describes the pain as dull and constant, boring in nature, and localized deep below the thigh muscle. He says it is worse at night. Physical examination is significant for tenderness and warmth over the anterior aspect of the left thigh. A plain radiograph of the left femur shows increased cortical thickness with widened intercortical space. Laboratory studies show:\nAlkaline phosphatase\n925 U/L\nSerum calcium\n9.2 mg/dL\nSerum phosphorus 4.4 mg/dL\nFindings on bone biopsy are shown in the image. Which of the following is the most likely diagnosis in this patient? <> context@']