Korean J Radiol.  2010 Jun;11(3):368-372. 10.3348/kjr.2010.11.3.368.

Cystic Embryonal Sarcoma of the Kidney: Report of a Case with US and CT Findings

• Kim BM
• Lee JY
• Lee YS
• Yoo DS
• Myong NH
• Lee GH
• Kim YM

• KMID: 946279
• DOI: http://doi.org/10.3348/kjr.2010.11.3.368

Abstract

Here we report a case in a 41-year-old woman histologically proven cystic embryonal sarcoma of the kidney, with emphasis on the imaging findings and pathological features. A large lobulated solid mass in the cystically dilated pelvocalyceal region was accompanied with hydroureter as depicted on both ultrasound and contrast-enhanced CT images.

Keyword

Kidney; Sarcoma; Cystic renal tumor

MeSH Terms

Adult
Diagnosis, Differential
Female
Follow-Up Studies
Humans
Imaging, Three-Dimensional/methods
Kidney/radiography/surgery/ultrasonography
Kidney Neoplasms/*radiography/surgery/*ultrasonography
Neoplasms, Germ Cell and Embryonal/*radiography/surgery/*ultrasonography
Sarcoma/*radiography/surgery/*ultrasonography
Tomography, X-Ray Computed/methods

Figure

• 

  Fig. 1 Imaging findings are presented for 41-year-old woman with cystic embryonal sarcoma. A. US scan revealed heterogeneous hypoechoic solid mass (black arrow) protruding into renal pelvis from upper pole, which was accompanied by hydronephrosis and hydroureter (white arrows). B. Color Doppler US image showing no vascularity in mass. C, D. Precontrast axial scans show hypodense mass with subtle high attenuated portion extending from upper pole to renal pelvis (black arrows). E, F. Postcontrast axial scans show hypodense mass with slightly enhancing solid portion (black arrows) accompanied by hydronephrosis. G. Coronal reformatted image shows slightly bulging contour hypodense mass with enhancing solid portion and internal fine reticular densities (black arrows) in left kidney upper pole and extending to renal pelvis. H. Gross specimen showing 8 × 6 × 4 cm tan, red and yellow myxoid lobulated tumor in markedly dilated pelvocalyceal system at left kidney upper pole. I. Photomicrograph of specimen showing that myxoid stromal sarcoma grew with protrude lobules that are lined by simple or stratified cuboidal epithelial cells (Hematoxylin & Eosin staining, ×40). J. Epithelial component showing focal carcinomatous transformation invading renal medulla (Hematoxylin & Eosin staining, ×200). K. Immunohistochemical staining for epithelial marker cytokeratin revealing strong immunoreactivity on cyst epithelial cells but no immunoexpression on underlying sarcoma component.

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