Abstract
A middle-aged male presented with gross enlargement of his lower right extremity (Figure 1). There was past medical history of Histiocytosis X, Parkes-Weber syndrome, and Klippel-Trenaunay syndrome. Radiographs show extensive periosteal and endosteal thickening involving multiple bones of the right lower extremity (Figure 2). Below knee amputation was performed and gross photographs reveal dense cortical bone overgrowth, entirely obliterating the intramedullary cavity (Supplemental Figure 1, available online at http://www.mayoclinicproceedings.org).
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