Korean J Urol.  2012 Dec;53(12):875-878. 10.4111/kju.2012.53.12.875.

A Case of Renal Schwannoma

• Yang HJ
• Lee MH
• Kim DS
• Lee HJ
• Lee JH
• Jeon YS

• KMID: 1988735
• DOI: http://doi.org/10.4111/kju.2012.53.12.875

Abstract

Schwannomas are benign tumors that arise from the neural sheath of Schwann cells. Renal schwannomas are extremely rare and are commonly misdiagnosed as renal cell carcinoma, which typically results in a radical nephrectomy. We present a case of a renal schwannoma that mimics a renal pelvis tumor.

Keyword

Kidney; Neurilemmoma

MeSH Terms

Carcinoma, Renal Cell
Kidney
Kidney Pelvis
Nephrectomy
Neurilemmoma
Schwann Cells

Figure

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  FIG. 1 (A) A computed tomography scan shows a centrally located renal mass abutting the spleen via the renal parenchyma. (B) A retrograde pyelograph shows a kinked left ureteropelvic junction, totally collapsed upper calyces, and an irregularly contrast-filled lower calyx.

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  FIG. 2 Gross photograph of the resected schwannoma. The lobulated mass is well-circumscribed and light yellow to gray-white in appearance and was located in the renal pelvis and compressed adjacent to the renal parenchyma.

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  FIG. 3 Histologic features of the resected schwannoma. (A) Most areas consisted of interlacing bundles of spindle cells and collagen and a peripheral cuff of lymphoid aggregates (H&E, ×100). (B) No nuclear atypia or mitotic figures were evident in the spindle cells (H&E, ×400).

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  FIG. 4 Immunohistochemical findings. Immunostaining showed diffuse strong positivity for S-100 (schwann cells) (×400).

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