PMC4896119_01
AP (A) and lateral (B) radiographs of the left index finger, demonstrating dense bone formation in all three phalanges. The dominant lesion involves the middle phalanx with smaller non-contiguous lesions in the proximal and middle phalanges. Both the cortex and the medullary space are involved by this process in all three sites.
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Radiographs displayed dense bone formation involving much of the middle phalanx, with a flowing, slightly expansile margin along its ulnar aspect (Figure 1).
Coronally (A) and sagittally (B) reformatted CT images of the left index finger, showing dense bone in all three phalanges, corresponding to the same areas shown in Figure 1. The endosteal hyperostosis completely fills the medullary space in the distal portion of the proximal phalanx.
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Computed tomography (CT) of the hand (Figure 2) demonstrated findings identical to those shown on the radiographs.