Kidney tumor - adult malignancies

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Kidney tumor - adult malignancies

Other neoplasms – adult or adult/child

Myxoma of kidney

Reviewers: Sean Williamson, M.D. (see Reviewers page)
Revised: 4 July 2012, last major update July 2012
Copyright: (c) 2003-2012, PathologyOutlines.com, Inc.

General
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● Rare; <20 cases reported (Am J Surg Pathol 1994;18:187)

Case reports
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● 36 year old man (Int J Urol 2007;14:242)
● 37 year old man with renal capsular tumor (Path Res Pract 2005;200:835)

Gross description
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● Well-demarcated, gelatinous, intraparenchymal tumor

Micro description
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● Abundant myxoid stroma with occasional spindle cells

Positive stains
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● Vimentin

Negative stains
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● S100, EMA, CAM 5.2, HHF-35, smooth muscle actin

Electron microscropy description
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● Fibroblast-like cells with elaborate cytoplasmic processes

Differential diagnosis
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● Fibroepithelial polyp: polypoid, usually in renal pelvis and covered by urothelium
● Myxoid sarcoma: spindle cells are more numerous and demonstrative atypia
● Myxolipoma: lipomatous component predominates
● Renomedullary interstitial cell tumor (medullary fibroma): fibroblast like cells and collagen; cells contain lipid, but overall appearance is not primarily myxoid

End of Kidney tumor - adult malignancies > Adult renal cell carcinoma > Myxoma of kidney

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