Malignant solitary fibrous tumor with superior vena cava syndrome.

Mediastinal solitary fibrous tumors, particularly those that are malignant, are rare. We report a case of malignant solitary fibrous tumor with superior vena cava syndrome and highly aggressive behavior. Postoperative radiotherapy was performed due to incomplete resection, but the tumor relapsed within 4 months. Gemcitabine-based chemotherapy was ineffective.