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Papillary Endothelial Hyperplasia

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This image shows a well-established lesion from a case of papillary endothelial hyperplasia. There are numerous small delicate papillae projecting into the lumen. They consist of plump endothelium lining a collagenized core. Taken out of context, it may be mistaken for angiosarcoma. However, one should remember that angiosarcomas are never confined to a vascular lumen.

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