In acute hematogenous osteomyelitis in children, after how many days do characteristic radiographic changes (periosteal reaction and lytic lesions) typically become visible on plain X-ray?
- A 1-2 days
- B 3-5 days
- C 7-14 days ✓
- D 21-28 days
Correct answer: C. 7-14 days
Explanation
Plain radiographic changes in acute osteomyelitis, including periosteal reaction and lytic lesions, become visible only after 7-14 days. Early in the disease (first week), X-ray is typically normal despite active infection. MRI can detect changes within 24-48 hours. This is a frequently tested fact distinguishing imaging modalities in early versus established osteomyelitis.
Reference: Tachdjian's Pediatric Orthopaedics, 5th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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