Abstract
A 50-year-old woman was admitted to the hospital because of an abnormal shadow detected incidentally by a routine chest X-ray, examination 4 years previously, when she was asymptomatic. The tumor gradually increased in size in those years. After admission, a partial resection of the lung including the tumor was performed. The tumor was attached to the visceral pleura of right lower lobe by a pedicle. Pathologically the tumor was solitary fibrous tumor of the pleura (localized fibrous mesothelioma). The histogenesis of solitary fibrous tumor is still controversial, but the mesencymal origin is preferred on the basis of immunohistochemical findings including CD34 positivity. In this case tumor cells also demonstrated positive for CD34.
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