Extrapleural SFTs are rare and have been found in the lung, pericardium, mediastinum, soft tissue of any site, and upper respiratory tract.SFTs of the central nervous system (CNS) are very rare.

• 肋膜外的单独纤维瘤罕见，发生部位包括肺、心包膜、纵膈腔、任何地方的软组织、上呼吸道，发生于中枢神经系统的单独纤维瘤更佔肋膜外肿瘤的少数，因此文献上少见。