1. Lee H, Cho JY, Kim SH, Jung DC, Kim JK, Choi HJ. Imaging findings of primitive neuroectodermal tumors of the kidney. J Comput Assist Tomogr. 2009; 33:882–886.
2. Pickhardt PJ, Lonergan GJ, Davis CJ Jr, Kashitani N, Wagner BJ. From the archives of the AFIP. Infiltrative renal lesions: radiologic-pathologic correlation. Armed Forces Institute of Pathology. Radiographics. 2000; 20:215–243.
3. Chinnaa S, Das CJ, Sharma S, Singh P, Seth A, Purkait S, et al. Peripheral primitive neuroectodermal tumor of the kidney presenting with pulmonary tumor embolism: a case report. World J Radiol. 2014; 6:846–849.
4. Dotan ZA, Tal R, Golijanin D, Snyder ME, Antonescu C, Brennan MF, et al. Adult genitourinary sarcoma: the 25-year Memorial Sloan-Kettering experience. J Urol. 2006; 176:2033–2038. discussion 2038-2039
5. Novick AC, Campbell SC. Renal tumors. In : Walsh PC, Retik AB, Vaughan ED, Wein AJ, editors. Campbell's urology. 8th ed. Philadelphia: Saunders;2002. p. 2673–2731.
6. Ciccarello G, Mucciardi G, Morgia G, Spinelli F, Ascenti G, Macchione L, et al. A case of renal capsular liposarcoma with intracaval fat thrombus. Eur Urol. 2010; 57:350–353.
7. Dalal KM, Antonescu CR, Singer S. Diagnosis and management of lipomatous tumors. J Surg Oncol. 2008; 97:298–313.
8. Zuetenhorst JM, Taal BG. Metastatic carcinoid tumors: a clinical review. Oncologist. 2005; 10:123–131.
9. Osamura RY, Inomoto C, Kajiwara H, DeLellis RA. Neuroendocrine carcinomas of diverse sites. Pathol Case Rev. 2006; 11:282–291.
10. Romero FR, Rais-Bahrami S, Permpongkosol S, Fine SW, Kohanim S, Jarrett TW. Primary carcinoid tumors of the kidney. J Urol. 2006; 176(6 Pt 1):2359–2366.
11. Kawajiri H, Onoda N, Ohira M, Nakatani T, Wakasa K, Ishikawa T, et al. Carcinoid tumor of the kidney presenting as a large abdominal mass: report of a case. Surg Today. 2004; 34:86–89.
12. Kendal WS. The comparative survival of renal leiomyosarcoma. Can J Urol. 2007; 14:3435–3442.
13. Katabathina VS, Vikram R, Nagar AM, Tamboli P, Menias CO, Prasad SR. Mesenchymal neoplasms of the kidney in adults: imaging spectrum with radiologic-pathologic correlation. Radiographics. 2010; 30:1525–1540.
14. Grasso M, Blanco S, Fortuna F, Crippa S, Di Bella C. Spontaneous rupture of renal leiomyosarcoma in a 45-year-old woman. Arch Esp Urol. 2004; 57:870–872.
15. Ochiai K, Onitsuka H, Honda H, Kawamoto K, Uozumi J, Kumazawa J, et al. Leiomyosarcoma of the kidney: CT and MR appearance. J Comput Assist Tomogr. 1993; 17:656–658.
16. Lalwani N, Prasad SR, Vikram R, Katabathina V, Shanbhogue A, Restrepo C. Pediatric and adult primary sarcomas of the kidney: a cross-sectional imaging review. Acta Radiol. 2011; 52:448–457.
17. Zakhary MM, Elsayes KM, Platt JF, Francis IR. Magnetic resonance imaging features of renal synovial sarcoma: a case report. Cancer Imaging. 2008; 8:45–47.
18. Gong J, Kang W, Li S, Yang Z, Xu J. CT findings of synovial sarcomas of the kidney with pathological correlation. Clin Imaging. 2013; 37:1033–1036.
19. Murphey MD, Gibson MS, Jennings BT, Crespo-Rodríguez AM, Fanburg-Smith J, Gajewski DA. From the archives of the AFIP: imaging of synovial sarcoma with radiologic-pathologic correlation. Radiographics. 2006; 26:1543–1565.
20. Froehner M, Manseck A, Haase M, Hakenberg OW, Wirth MP. Locally recurrent malignant fibrous histiocytoma: a rare and aggressive genitourinary malignancy. Urol Int. 1999; 62:164–170.
21. Shirkhoda A, Lewis E. Renal sarcoma and sarcomatoid renal cell carcinoma: CT and angiographic features. Radiology. 1987; 162:353–357.
22. Eroğlu M, Bakirtaş H, Cimentepe E, Unsal A, Ataoğlu O, Balbay MD. Malignant fibrous histiocytoma arising from the renal capsule. Urol Int. 2005; 75:368–370.
23. Kearney MM, Soule EH, Ivins JC. Malignant fibrous histiocytoma: a retrospective study of 167 cases. Cancer. 1980; 45:167–178.
24. Kitajima K, Kaji Y, Morita M, Okuda Y, Sugimura K. Malignant fibrous histiocytoma arising from the renal capsule. Magn Reson Med Sci. 2003; 2:199–202.
25. Venter A, Roşca E, Muţiu G, Daina L, Pirte A. Difficulties of diagnosis in retroperitoneal tumors. Rom J Morphol Embryol. 2013; 54:451–456.
26. Sanyal R, Remer EM. Radiology of the retroperitoneum: case-based review. AJR Am J Roentgenol. 2009; 192:6 Suppl. S112–S117. Quiz S118-S121.
27. Chaudhari S, Hatwal D, Suri V. A rare case of primary fibrosarcoma of kidney. Iran J Kidney Dis. 2013; 7:67–69.
28. Funston MR, Levine E, Stables DP. Spontaneous renal hemorrhage. Urology. 1976; 8:610–617.
29. Raby WN, Kopplin P, Weitzman S. Metastatic osteosarcoma of the kidney presenting as renal hemorrhage. J Pediatr Hematol Oncol. 1996; 18:321–322.
30. Jeffree GM, Price CH, Sissons HA. The metastatic patterns of osteosarcoma. Br J Cancer. 1975; 32:87–107.
31. Caoili EM, Davenport MS. Role of percutaneous needle biopsy for renal masses. Semin Intervent Radiol. 2014; 31:20–26.
32. Lee SW, Lee MH, Yang HJ, Yang WJ, Kim DS, Lee NK, et al. Experience of ultrasonography-guided percutaneous core biopsy for renal masses. Korean J Urol. 2013; 54:660–665.
33. Volpe A, Mattar K, Finelli A, Kachura JR, Evans AJ, Geddie WR, et al. Contemporary results of percutaneous biopsy of 100 small renal masses: a single center experience. J Urol. 2008; 180:2333–2337.