Originally Posted by Citrus
No it is not viral or bacterial... it is cancerous. Hope this helps.
It is actually almost never cancerous, simply a benign tumor. Technically Cushings is a human disease, the disease in horses is called Pituitary Pars Intermedia Dysfunction or PPID. Though the two are extremely similar there are some differences (just putting that out there for those who may have Cushings themselves and have some background on the disease). It is also slowly becoming recognized as a group of symptoms known as Equine Metabolic Syndrome. Here is an excellent article on it. http://www.thehorse.com/pdf/factshee...c-syndrome.pdf