Osteochondroma of the fibula
Acute lateral right knee pain, especially after exercise.
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A bony protuberance is seen projecting from the lateral aspect of the proximal fibula. It shows a smooth cortical line as well as medullary continuity.
Osteochondromas are the most common benign tumor, or tumor-like lesion of bone.
Plain radiography is usually sufficient to make a diagnosis. The findings in this case are typical of osteochondroma, with features including a lesion comprising both cortical and medullary bone with an overlying cap of hyaline cartilage.
Osteochondromas usually present as slow-growing masses and are an incidental finding in many cases. On rare occasion they can transform into malignant chrondrosarcoma.
- 1. Kumar V, Abbas AK, Fausto N, Aster JC. Robbins and Cotran pathologic basis of disease, professional edition e-book. elsevier health sciences; 2014 Aug 27.