Incidence, distribution, and morphology of amyloidosis in Charles Rivers CD-1 mice

The incidence, morphology, and distribution of amyloidosis were reviewed in a 2-year toxicity-oncogenicity study in Charles Rivers CD-1 mice. Amyloid was present in the duodenum, jejunum, mesenteric lymph node, and ovary in animals sacrificed at 8 months. In animals sacrificed at 12 months, amyloid was also present in the adrenal gland, gall bladder, heart, ileum, kidney, pancreas, parathyroid, spleen, glandular stomach, testis, and thyroid. In the animals sacrificed at 24 months, the gland was also involved. The organs most frequently involved at 24 months included the adrenal gland, duodenum, jejunum, ileum, heart, kidney, liver, mesenteric lymph node, ovary, spleen, and thyroid.