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We report three cases of solitary fibrous tumor (SFT) arising in the orbit. All patients presented with nontender swelling of the affected eye, and one patient presented with nasolacrimal duct obstruction. All three patients had well-circumscribed tumors that had histologic features identical to those of SFT of the pleura (fibrous mesothelioma). The neoplastic cells were purely fibrogenic. They were reactive with antivimentin and CD-34 and demonstrated no smooth muscle or neural differentiation (nonreactive with antibodies to actin, desmin, and S 100 protein). KP-1 (CD-68) immunoreactivity was present focally within the neoplastic cells in all three tumors; however, it was strongly positive within tumor infiltrating macrophages. Electron microscopy per formed on one tumor showed fine fibroblastic differentiation with phagocytic activity confined to infiltrating macrophages. SFT of the orbit is a distinct pathologic entity that merits distinction within the broad group of orbital fibrous tumors. Int J Surg Pathol 2(3):193-198, 1995
We report three cases of solitary fibrous tumor (SFT) arising in the orbit. All patients presented with nontender swelling of the affected eye, and one patient presented with nasolacrimal duct obstruction. All three patients had well-circumscribed tumors that had histologic features identical to those of SFT of the pleura (fibrous mesothelioma). The neoplastic cells were purely fibrogenic. They were reactive with antivimentin and CD-34 and demonstrated no smooth muscle or neural differentiation (nonreactive with antibodies to actin, desmin, and S 100 protein). KP-1 (CD-68) immunoreactivity was present focally within the neoplastic cells in all three tumors; however, it was strongly positive within tumor infiltrating macrophages. Electron microscopy per formed on one tumor showed fine fibroblastic differentiation with phagocytic activity confined to infiltrating macrophages. SFT of the orbit is a distinct pathologic entity that merits distinction within the broad group of orbital fibrous tumors. Int J Surg Pathol 2(3):193-198, 1995
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