PT - JOURNAL ARTICLE AU - Tian, Jin-Ling AU - Cui, Bang-Ping TI - Mixed epithelial and stromal tumor of the kidney on <sup>18</sup>F-FDG PET/CT in a 21-year-old female AID - 10.15537/smj.2019.5.24177 DP - 2019 May 01 TA - Saudi Medical Journal PG - 499--502 VI - 40 IP - 5 4099 - http://smj.org.sa/content/40/5/499.short 4100 - http://smj.org.sa/content/40/5/499.full SO - Saudi Med J2019 May 01; 40 AB - Mixed epithelial and stromal tumor of the kidney (MESTK) is a rare tumor composed of epithelium and interstitium. In radiological imaging, the masses are cystic and solid, and it is difficult to distinguish MESTK from renal cystic lesions. A final diagnosis of MESTK depends on pathology. We report this rare case of MESTK that was diagnosed in a 21-year-old woman. 18F-labeled fluoro-2-deoxy glucose (18F-FDG) positron emission tomography (PET)/computerized tomography (CT) and contrast-enhanced computerized tomography features of MESTK are presented, and could potentially provide useful information for the differential diagnoses of cystic renal neoplasms and preoperative staging of the tumor.