Ed: 15 May 2015 Accepted: 9 JulyConclusion The calcification is not a …

Ed: 15 May 2015 Accepted: 9 JulyConclusion The calcification is not a reason to reject a diagnosis of CCSK. Consent Written informed consent was obtained from the parents of the patient for publication of this Case Report and any accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.Competing interests The authors declare that they have no competing interests. Authors' contribution MK, YS, KF, MO, HK were paediatric oncologists for chemotherapy. KO and TT were paediatric sergeants for operation. MK and YS Staurosporine analysed and interpreted the patient data, drafted the manuscript and made the figures. SK performed radiological analysis. KH performed the histological examination. HK proposed the study, supervised and revised the manuscript. KF, MO and OA have made substantial contributions to analysis and interpretation of patient data. All authors read and approved the final manuscript. Acknowledgements Acknowledgements to Dokkyo Medical University Hospital Tochigi Children Medical Centre team staffes. Acknowledgements to Annabel Boyes and Aaron Stallard for language corrections.References 1. Argani P, Perlman EJ, Breslow NE, Browning N, Green D, D'Angio G, et al. Clear cell sarcoma of the kidney: a review of 351 cases from the National Wilms Tumor Study Group Pathology Center. Am J Surg Pathol. 2000;24(1):4. 2. Gooskens SL, Furtwangler R, Vujanic GM, Dome JS, Graf N, van den Heuvel-Eibrink MM. Clear cell sarcoma of the kidney: a review. Eur J Cancer. 2012;48(14):2219?6. 3. Dickson PV, Sims TL, Streck CJ, McCarville MB, Santana V, McGregor L, et al. Avoiding misdiagnosing neuroblastoma as Wilms tumor. J Pediatr Surg. 2008;43(6):1159?3. 4. Masuda H, Azuma H, Nakajima F, Watsuji T, Katsuoka Y. Adult Wilms' tumor with calcification untreated for 5 years--a case report. BMC Urol. 2004;4:5. 5. Glass R, Davidson A, Fernbach S. Clear cell sarcoma of the kidney: CT, sonographic, and pathologic correlation. Radiology. 1991;180(3):715?. 6. Salamat MS. Robbins and Cotran: Pathologic Basis of Disease. 8th ed. Philadelphia: Elsevier Saunders; 2010. p. 38. 7. O'Meara E, Stack D, Lee CH, Garvin AJ, Morris T, Argani P, et al. Characterization of the chromosomal translocation t(10;17)(q22;p13) in clear cell sarcoma of kidney. J Pathol. 2012;227(1):72?0. 8. Ueno H, Okita H, Akimoto S, Kobayasi K, Nakabayashi K, Hata K, et al. DNA methylation profile distinguishes clear cell sarcoma of the kidney from other pediatric renal tumors. PLoS One. 2013;8(4), e62233. 9. Nagashima Y, Kuroda N, Yao M. Transition of organizational category on renal cancer. Jpn J Clin PubMed ID:https://www.ncbi.nlm.nih.gov/pubmed/16989806 Oncol. 2013;43(3):233?2. 10. Kuroda N, Mikami S, Pan CC, Cohen RJ, Hes O, Michal M, et al. Review of renal carcinoma associated with Xp11.2 translocations/TFE3 gene fusions with focus on pathobiological aspect. Histol Histopathol. 2012;27(2):133?0. 11. Sukov WR, Hodge JC, Lohse CM, Leibovich BC, Thompson RH, Pearce KE, et al. TFE3 rearrangements in adult renal cell carcinoma: clinical and pathologic features with outcome in a large series of consecutively treated patients. Am J Surg Pathol. 2012;36(5):663?0. 12. Kalapurakal JA, Perlman EJ, Seibel NL, Ritchey M, Dome JS, Grundy PE. Outcomes of patients with revised stage I clear cell sarcoma of kidney treated in National Wilms Tumor Studies 1?. Int J Radiat Oncol Biol Phys. 2013;85(2):428?1.Kato et al. Diagnostic Pathology (2015) 10:Page 4 of13. Zhuge Y, Cheung MC, Yang R, Perez EA, Koniaris LG, Sola JE.