Abstract
Solitary fibrous tumors were initially described in the pleural cavity and they were thought to have mesothelial origin. Nowadays, these tumors are known to have origin in the mesenchymal cells and they are ubiquitous with both pleural and extrapleural distribution. There are many extrapleural localizations, being the pelvis one of the rarest and the most challenging to diagnose. Usually, solitary fibrous tumors are clinically insidious and manifest as a slow-growing large tumor. At imaging, these tumors have different characteristics, and computed tomography and magnetic resonance play an important role in their diagnosis. Solitary fibrous tumors appear as heterogeneous enhancement on contrast-enhanced computed tomography, intermediate signal on T1-weighted images, hypointense on T2-weightes images and show intense heterogeneous enhancement in dynamic sequences. When they appear in the female pelvis, it is essential to recognize their radiological characteristics, in order to differentiate it from others tumors, like pure stromal ovarian tumors or Brenner tumors. This study reviews the female pelvis solitary fibrous tumors’ imaging findings and its differential characteristics from more common tumors, by describing illustrative confirmed cases.