TY - CHAP M1 - Book, Section TI - The Vascular Purpuras A1 - Lichtman, Marshall A. A1 - Kaushansky, Kenneth A1 - Kipps, Thomas J. A1 - Prchal, Josef T. A1 - Levi, Marcel M. Y1 - 2011 N1 - T2 - Williams Manual of Hematology, 8e AB - Purpura is the extravasation of red cells from vasculature into the skin and/or subcutaneous tissues.Petechiae are lesions less than 2 mm in diameter.Purpura describes lesions 2 mm to 1 cm.Ecchymoses are lesions greater than 1 cm.Erythema is reddened skin due to increased capillary flow.Telangiectasia is dilated superficial capillaries.Erythema and telangiectasia blanch with pressure. This can be easily demonstrable with a glass microscope slide. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/28 UR - hemonc.mhmedical.com/content.aspx?aid=1126654548 ER -