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Review Question - QID 211419

Osteomyelitis - Adult Complications Malignant transformation QID: 211419 (SBQ18TR.29)
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QID 211419 (Type "211419" in App Search)
A 60-year-old male presents with a large necrotic ulcerative lesion over the anterior tibia over the past 6 months. He admits to a remote history of a midshaft tibia fracture treated with open reduction and internal fixation complicated by a chronically draining wound near the location of the lesion. Biopsy of the ulcerative lesion reveals squamous cell carcinoma. Which of the following is the likely precursor of this malignant lesion?
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