A cervical mass in a laboratory rhesus macaque (Macaca mulatta): Suspicion of air sacculitis.

A 13-year-old rhesus macaque presented a cervical swelling associated with sudden deterioration of its condition. This mass was surgically removed, and its histopathological examination revealed a stratified squamous epithelium. This appearance has been reported in some case of air sacculitis in others non-human primate species.