en Medical Physics Medical Physics مطالعه موردي Case Report <div style="text-align: justify;">A solitary fibrous tumor of the urinary bladder is an extremely rare type of mesenchymal tumor. We present a case of an 85-year-old woman with a large (14.5&times;10.7&times;10.1&nbsp;cm) protruding intravesical mass detected by computed tomography (CT) and magnetic resonance imaging (MRI), which was proven to be a solitary fibrous tumor through histopathological examination. The clinicopathologic and radiological features are here discussed, along with a review of the published literature on this topic. Solitary fibrous tumors of the urinary bladder are more common in men (76%), with a peak incidence in people 40&ndash;60 years old. Most such tumors show heterogeneous intensity with a complete capsule. A decrease in the T2WI signal with an increase in collagen tissue content and gradual enhancement on CT/MRI images are their main features. Most such tumors are positive for CD34 under immunohistochemistry (100% in 24 available cases). The majority of tumors (88%) studied have been non-malignant and most patients (95.5%) showed favorable prognosis after a long-term follow-up.</div> Solitary fibrous tumor, urinary bladder, computed tomography, magnetic resonance imaging, histopathological. 465 471 http://ijrr.com/browse.php?a_code=A-10-2188-17&slc_lang=en&sid=1 W. Shi 7900319475328460020187 7900319475328460020187 No College of Medical Imaging, Shanxi Medical University, Shanxi Province, China X. Liang 7900319475328460020188 7900319475328460020188 No College of Medical Imaging, Shanxi Medical University, Shanxi Province, China X. Wang 7900319475328460020189 7900319475328460020189 No Department of Radiology, First Hospital of Shanxi Medical University, Shanxi Province, China J. Qin 7900319475328460020190 7900319475328460020190 No Department of Radiology, First Hospital of Shanxi Medical University, Shanxi Province, China H. Zhang hanghui_mr@163.com 7900319475328460020191 7900319475328460020191 Yes Department of Radiology, First Hospital of Shanxi Medical University, Shanxi Province, China Y. Tan tanyan123456@sina.com 7900319475328460020192 7900319475328460020192 No Department of Radiology, First Hospital of Shanxi Medical University, Shanxi Province, China