Pancreas: Angiectasis in islets. The capillary of the islets is associated with dilatation and congestion. The spontaneous occurrence of this change is very rare. It has been described that similar angiectasis was induced in cynomolgus monkeys treated with an antineoplastic immunomodulator. Histopathology of incidental findings in cynomolgus monkeys ( macaca fascicularis ) used in toxicity studies: Sato J, Doi T, Kanno T, Wako Y, Tsuchitani M, Narama I - Journal of toxicologic pathology (2012). Not altered. CC.