Adrenal lesions in the baboon (Papio spp).

A histological survey was conducted on 604 pairs of adrenal glands from yellow (Papio cynocephalus) and olive (Papio anubis) baboons used in drug safety evaluation studies. Spontaneous lesions were found in 372 glands--34 of which had more than one change. Cortical lesions consisted of accessory nodules (190), nodular hyperplasia (7), hepatoadrenal adhesion (18) and partial fusion (1), focal mineralization (20), ectopic bone marrow (6), and focal fatty change (60). Medullary lesions were confined to focal lymphocytic (66) and plasma cell (1) infiltrates.