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Washington University Experience | VASCULAR | Intravascular Papillary Endothelial Hyperplasia (Masson Tumor) | 1E2 Intravascular Papillary Endothelial Hyperplasia (Case 1) SMA 9
1E2-5 The central constituent cells of the papillae are immunoreactive for smooth muscle actin. (SMA IHC).
