Morphology of valve allografts (homografts) valve and pulmonary valve autografts. (A) Gross photograph of pulmonary valve allograft removed following 7.

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Morphology of valve allografts (homografts) valve and pulmonary valve autografts. (A) Gross photograph of pulmonary valve allograft removed following 7 years for conduit stenosis in a child. The pulmonary arterial wall is heavily calcified but the cusps are not. (B) Gross appearance of cryopreserved aortic valve allograft removed at 3 years for aortic insufficiency. (C) Comparative morphologic features of autografts and homografts obtained from the same patients. Autograft valves had near-normal structure and cellular population (a, c, e), in contrast, homografts from the same patients (b, d, f) had a progressive collagen hyalinization and loss of cellularity. Bar = 200 μm. × 400. ([C] Reproduced with permission from Rabkin-Aikawa E, Aikawa M, Farber M, et al: Clinical pulmonary autograft valves: pathological evidence of adaptive remodeling in the aortic site. J Thorac Cardiovasc Surg 2004; 128:552-562.) Source: Chapter 5. Cardiovascular Pathology, Cardiac Surgery in the Adult, 4e Citation: Cohn LH. Cardiac Surgery in the Adult, 4e; 2012 Available at: http://accesscardiology.mhmedical.com/DownloadImage.aspx?image=/data/books/cohn4/cohn4_c005f025a.png&sec=39680040&BookID=476&ChapterSecID=39679016&imagename= Accessed: October 03, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved