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Intraosseous ganglion (IOG) is the most frequently occurring bone lesion within the carpus and is often an incidental finding on radiographs obtained for other reasons. Two types of IOG have been described: an “idiopathic” form (or type I), the pathogenesis of which has not been completely clarified, and a “penetrating” form (or type II), caused by the intrusion of juxtacortical material (often a...