Osteochondroma

Figure 1. Osteochondroma

Detail frontal radiograph shows a rounded opacity projected over the left mid-lung.

Figure 2. Osteochondroma

Axial CT shows that the lesion originates from bone, not from lung. Note how the medullary canal of the affected rib is contiguous with the medullary canal of the lesion: this morphology is characteristic of osteochondromas.

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