Mixed Epithelial and Stromal Tumor of the Kidney

Sun Il Kim; Sung Ryong Kim; Soo Hyung Lee; Hee Jae Joo; Sung Hoon Park; Se Joong Kim

doi:10.4111/kju.2008.49.2.174

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Kim, Kim, Lee, Joo, Park, and Kim: Mixed Epithelial and Stromal Tumor of the Kidney

Case Report

Korean Journal of Urology

Korean Journal of Urology 2008; 49(2): 174-176.

Published online: 29 February 2008

DOI: https://doi.org/10.4111/kju.2008.49.2.174

Mixed Epithelial and Stromal Tumor of the Kidney

Sun Il Kim, Sung Ryong Kim, Soo Hyung Lee, Hee Jae Joo¹, Sung Hoon Park, Se Joong Kim

Department of Urology, Ajou University School of Medicine, Suwon, Korea.

¹Department of Pathology, Ajou University School of Medicine, Suwon, Korea.

sejoong@ajou.ac.kr

Received 9 October 2007 Accepted 16 October 2007

Abstract

Mixed epithelial and stromal tumor of the kidney (MEST) is a rare, recently described benign renal neoplasm that predominantly affects perimenopausal women. It is composed of dual components of epithelial and stromal cells, and the tumor is characterized by admixed cystic and solid growth patterns. Herein, we report on a case of MEST in a 35-year-old woman who presented with an incidentally found renal tumor. The patient has had no evidence of disease 4 years after the surgery.

Keywords: Kidney neoplasms, Complex and mixed neoplasms, Epithelial cells, Stromal cells

Figures and Tables

Fig. 1

Contrast-enhanced CT scan shows a 5cm sized inhomogeneous mass on the right upper portion of the kidney.

Fig. 2

Bisected right kidney shows a round well-defined, pinkish white, partly solid and multifocally cystic yellowish rubbery mass involving the upper pole at the periphery, and the mass measured 4.5×4cm.

Fig. 3

The tumor is composed of variegated cellular stroma and multilocular cysts and tubules lined by columnar, cuboidal or flattened epithelial cells without atypia (H&E, ×100).

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