Kidney tumor - cysts, children, adult benign

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Kidney tumor - cysts, children, adult benign

Benign (usually) adult tumors

Hemangioma

Reviewers: Mandolin Ziadie, M.D. (see Reviewers page)
Revised: 26 January 2012, last major update January 2012
Copyright: (c) 2003-2012, PathologyOutlines.com, Inc.

General
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● Benign vascular lesion similar to that seen in soft tissue
● May be capillary, cavernous or mixed

Epidemiology
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● May clinically / radiologically resemble cystic renal cell carcinoma (Int J Clin Oncol 2008;13:166)
● Usually asymptomatic, but may cause recurrent hemorrhage / hematuria
● May be associated with vascular malformation syndromes including Klippel-Trenaunay and Sturge-Weber

Case reports
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● 22 year old woman with giant cavernous hemangioma (AJR Am J Roentgenol 2004;182:411)
● 40 year old woman with gross hematuria (Int Braz J Urol 2004;30:216)

Gross description
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● Small (may be difficult to find) reddish-blue tumor in medulla / cortex / capsule
● Usually at tips of papillae; 10% are multiple

Micro description
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● Proliferation of small or large anastamosing vessels with benign endothelium
● Mitoses may be present but are not atypical
● Cavernous type is most common

Micro images
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Mixed capillary-cavernous hemangioma

Massive cavernous hemangioma occupies much of renal medulla and pelvis

Cavernous hemangioma of bladder

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

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