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AITL : Morphology - High Endothelial Venules

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The proliferation of branching, post-capillary high endothelial venules is a key histologic feature of angioimmunoblastic T-cell lymphoma (AITL). They are best seen with PAS or Gomori stains that highlight the thickened basement membrane of the vessel walls.

High endothelial venules are easily recognized in this image even at low magnification.

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