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Kidney tumor - cysts, children, adult benign

Benign (usually) adult tumors

Myelolipoma


Reviewers: Mandolin Ziadie, M.D. (see Reviewers page)
Revised: 15 August 2013, last major update February 2012
Copyright: (c) 2003-2013, PathologyOutlines.com, Inc.

General
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● Adipose and hematopoietic tumor usually diagnosed in adrenal gland

Epidemiology
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● Rare
● < 50 cases outside of adrenal gland with < 25 cases in kidney
● May coexist with other tumors: papillary urothelial carcinoma (Int J Surg Pathol 2010;18:437)

Clinical features
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● Benign

Case reports
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● 65 year old man with hilar tumor (Arch Pathol Lab Med 2006;130:1049)
● 66 year old man with renal sinus tumor (Arch Pathol Lab Med 1999;123:631)
● 66 year old man with perirenal tumor (Arch Pathol Lab Med 1994;118:188)

Gross images
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Well-delineated lesion (arrow) infiltrating into hilum


73 year old man with pelvic tumor

Micro description
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● Mixture of adipose tissue and normal hematopoietic cells
● No bony spicules
● Not connected to medullary cavity of any bone by definition

Micro images
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Fat cells and hematopoietic cells


Myelolipoma separated from renal parenchyma by fibrous band (arrow)


Various images

End of Kidney tumor - cysts, children, adult benign > Benign (usually) adult tumors > Myelolipoma


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