Kidney tumor - cysts, children, adult benign

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Kidney tumor - cysts, children, adult benign

Benign (usually) adult tumors

Lipoma

Reviewers: Mandolin Ziadie, M.D. (see Reviewers page)
Revised: 27 March 2012, last major update January 2012
Copyright: (c) 2003-2012, PathologyOutlines.com, Inc.

General
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● Extremely rare; usually incidental

Epidemiology
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● Most commonly diagnosed in middle-age women

Case reports
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● 42 year old woman with huge retroperitoneal mass (Br J Radiol 2006;79:e148)
● 71 year old man (Kaohsiung J Med Sci 2005;21:383)

Gross images
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Parapelvic lipomatosis

Tumor appears to arise in hilar adipose tissue

Micro description
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● Well circumscribed tumor of benign adipocytes

Micro images
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Cortical tumor projects beneath the renal capsule

Differential diagnosis
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● Angiomyolipoma: usually vascular and smooth muscle components; positive for melanocytic markers
● Pelvic lipomatosis: associated with renal atrophy and hydronephrosis but not primarily a kidney lesion
● Atypical lipomatous tumor of retroperitoneum: large tumor with hyperchromatic atypical nuclei

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

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