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Subungual exostosis. On X-rays (a), a mineralized mass is noted in contiguity with the dorsal aspect of the distal phalanx of the big toe. On sagittal CT (b) and T1-weighted MRI (c) images, no cortical or marrow continuity with the underlying bone is seen. Subungual exostosis was pathologically proven. Arrow points at the lesion in all images
