General
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• Very rare in heart
• May recur after surgery, particularly in adults

Case reports
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• 70 year old woman with right atrial mass (J Clin Pathol 2004;57:1338)

Micro description
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• Round, undifferentiated to epithelioid cells surrounding prominent, thin walled, staghorn vessels

Micro images
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Various images

Positive stains
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• Alpha smooth muscle actin

Negative stains
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• CD34

Differential diagnosis
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• Epithelioid hemangioendothelioma
• Glomus tumor
• Hemangiopericytoma: CD34+, actin-
• Solitary myofibroma
• Vascular leiomyoma

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