To our knowledge, this report represents the first description of thyroid gland tumors in an African Green Monkey (Chlorocebus aethiops). Two cystadenomas as well as a solid follicular adenoma are described in a 27-year-old female. No indications of excessive hormone production due to the tumors were detected.

To our knowledge, this study is the first report of spontaneous Hashimoto-like chronic lymphocytic thyroiditis in a rhesus macaque (Macaca mulatta). Despite the microscopic similarities to human cases, autoantibodies (thyroglobulin antibodies, thyriod peroxidase antibodies, and thyroid-stimulating hormone receptor antibodies) were not identified in this rhesus macaque using a human electrochemiluminescence immunoassay system.

This report describes a reactive mesothelial hyperplasia as a reaction to a polyserositis in an African green monkey (Chlorocebus aethiops) mimicking an epitheloid mesothelioma. Histopathology, immunohistochemistry, fluorescence in situ hybridization, and electron microscopy were used to determine the benign nature of the mesothelial proliferation. For the first time, human genetic probes had been successfully applied to an African green monkey.

We present a spontaneous tumor of the meninges (meningioma) in a female pig-tailed macaque (Macaca nemestrina) more than 24 years old. Clinically, the monkey displayed slow, weak, and insecure movements and poor vision. A tumorous mass was present at the floor of the cranial cavity. It compressed adjacent parts of the brain, infiltrated surrounding bones, and expanded into the throat. Microscopically, the tumor showed both meningothelial and microcystic parts.

This review shows that mouse lemurs show various ocular impairments which may distort vision. The most widespread and obvious ocular finding were nuclear sclerosis and cataracts. Both highly increase with increasing age. Iris posterior synechia has been described in different colonies and seems highly age dependent and cataract associated. Combined with the variety of many other eye diseases, special ophthalmological treatments and examinations are required to ensure animal well-being.