Intrapulmonary solitary fibrous tumor coexisting with lung adenocarcinomas

BACKGROUND: Solitary fibrous tumor (SFT) is a rare tumor of mesenchymal origin and accounts for < 2% of all soft tissue masses. Although SFT has been identified in multiple anatomic locations and can grow anywhere in the body, intrapulmonary SFT are rare. CASE PRESENTATION: In this report, we presented a rare case of intrapulmonary solitary fibrous tumor (SFT) coexisting with lung adenocarcinoma in a 74-year-old man. Chest computed tomography showed a well-defined nodule with punctate calcification and measuring 2.3 × 2.1 cm and two ground-grass nodules with solid component. To obtain a definitive diagnosis and achieve complete resection, surgery was performed. The postoperative diagnosis was intrapulmonary SFT coexisting with lung adenocarcinoma. After surgery, he survived for 6 months without any signs of recurrence. CONCLUSION: Complete resection may be the best treatment for intrapulmonary SFT. Careful follow-up of the postoperative course is important, because differentiating between benignity and malignancy is difficult by histologic findings alone.