Keivan Jamsidi, Ozlem Ozmen, Microanatomical Patterns of Renal Amyloidosis in Domestic Sheep, Iran, Veterinary Research, Volume 10,Issue 3, 2017, Pages 15-20, ISSN 1993-5412, vr.2017.15.20, (https://makhillpublications.co/view-article.php?doi=vr.2017.15.20) Abstract: Amyloidosis represents a heterogenous group of diseases that have in common the deposition of fibrils composed of proteins of beta-pleated sheet structure, a structure which can be specifically identified by histochemistry using the Congo red (CR) or similar stains. Between October 2013 to April 2014 (6 months) different patterns of renal amyloidosis was diagnosed on histpathological examination of kidneys belong to 196 out of 7065 slaughtered sheep subjected to postmortem examination. Microscopic examination of renal tissue sections stained with Hematoxylin-Eosin (H&E) and CR staining techniques, revealed 3 patterns of renal amyloid deposition including glomerular (22.72%), medullary (68.18%) and vascular (9.09%). Renal Medullary Amyloidosis (RMA) was detected as the most prevalence pattern of renal amyloidosis in domestic sheep in Iran. Keywords: Amyloidosis;Iran;kidney;sheep;CR