Histopathologic and imageological features of solitary fibrous tumor of the kidney(One case report and literature review)

Objective:To explore the histopathologic and imageological features of solitary fibrous tumor(SFT)of the kidney.Method:One case of SFT of the kidney with 1cm in diameter was detected by ultrasound, abdominal CT and MRI preoperatively.Postoperative pathological examination was also taken.Then relevant lit- eratures were reviewed as a referrence to the data of the patient.Result:Imageological examinations showed renal parenchymatous tumor.On pathologic examination,spindle tumor cells were arranged in no particular pattern, with numerous thin-walled vessels and collagen fiber bundle.It also showed that tumor cells were mild with ob- scure boundary,eosinophilic cytoplasm,inconspicuous nucleoli and rare mitosis.Immunohistochemical staining showed that CD34+,vimentin+,bcl-2+,CD99+,CD10+,CD31-,SMA-,desmin-,S-100-,PCK-, EMA-,CD21-,CD23-.Proliferation index of Ki-67was 5%.Conclusion:Primary solitary fibrous tumor of the kidney is very rare.Some characteristics of such small tumors may be seen through imageological examinations, but the final diagnosis still depends on pathological examinations.