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Subungual exostoses are bony projections which arise from the dorsal surface of the distal phalanx, most commonly of the hallux. ==Presentation== They tend to be painful due to the pressure applied to the nail bed and plate. They can involve destruction of the nail bed. These lesions are not true osteochondromas, rather it is a reactive cartilage metaplasia. The reason it occurs on the dorsal aspect is because the periosteum is loose dorsally but very tightly adherent volarly. 〔Murphey MD, Choi JJ, Kransdorf MJ, et al: Imaging of osteochondroma: variants and complications with radiologic-pathologic correlation. Radiographics 20:1407-1434, 2000〕 Subungal malignant melanomas can also occur in canines. They are distinct from subungual osteochondroma. File:Subungual_exostosis_01.JPG|Subungual exostosis (1/3), in a boy of 15 years old File:Subungual_exostosis_02.JPG|Subungual exostosis (2/3) File:Subungual_exostosis_03.JPG|Subungual exostosis (3/3), after excision 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Subungual exostosis」の詳細全文を読む スポンサード リンク
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