General
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• Definition: highly malignant undifferentiated tumor of infants and children
• See also Kidney tumor chapter
• Originally described in kidneys; very rare in heart (one case report)

Case reports
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• 6 month old infant with malignant rhabdoid tumor (Cancer 1985;55:2850)

Negative stains
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• Desmin, actin

Electron microscopy description
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• Masses of intermediate filaments

Differential diagnosis
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• Rhabdomyosarcoma: desmin+

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