Myelolipomas in Adult Goeldi's Monkeys (Callimico goeldii)

Abstract

Hepatic myelolipomas were found in four Goeldi's monkeys (Callimico goeldii) from a small colony originated from 3 animals imported from South America and sustained in Monkey Center of Japan, and the histological features were compared with the hepatic extramedullary foci of hemopoiesis in the fetus or newborn monkeys of this species. The histological features were analogous to those of myelolipomas of the liver, spleen or adrenals in other animals and man. The cause of the relatively high incidence of this rare lesion in these monkeys remains nuclear, but, the close genetic background and identical environmental conditions, including diet are mentioned as possible pathogenic factors.