Korean J Urol.  2008 Feb;49(2):174-176.

Mixed Epithelial and Stromal Tumor of the Kidney

• Kim SI
• Kim SR
• Lee SH
• Joo HJ
• Park SH
• Kim SJ

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.

Keyword

Kidney neoplasms; Complex and mixed neoplasms; Epithelial cells; Stromal cells

MeSH Terms

Adult
Epithelial Cells
Female
Humans
Kidney
Kidney Neoplasms
Neoplasms, Complex and Mixed
Stromal Cells

Figure

• 

  Fig. 1 Contrast-enhanced CT scan shows a 5cm sized inhomogeneous mass on the right upper portion of the kidney.

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  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.

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  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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