AMERICAN SHARED HOSPITAL SERVICES (NYSE American: AMS), a leading provider of turnkey technology solutions for advanced radiosurgical and radiation therapy services, announced today that physicians have begun treating patients at the Gamma Knife del Pacífico Institute that AMS has opened at the Air Force Hospital in Lima, Peru. AMS Chairman and Chief Executive Officer Ernest A. Bates, M.D., said, "We are proud that AMS has made the benefits of the Gamma Knife available to cancer patients in Peru. With a population of more than 9 million in metropolitan Lima alone, and more than 28 million in the country as a whole, we anticipate significant demand for Gamma Knife services at our newest center, the first and only Gamma Knife center in Peru." Dr. Aldo Berti, an internationally recognized neurosurgeon, is the medical director for the Gamma Knife program at the Gamma Knife del Pacífico Institute. About AMS American Shared Hospital Services provides turnkey technology solutions for advanced radiosurgical and radiation therapy services. AMS is the world leader in providing Gamma Knife radiosurgery equipment, a non-invasive treatment for malignant and benign brain tumors, vascular malformations and trigeminal neuralgia (facial pain). The Company also offers proton therapy, the latest IGRT and IMRT systems, as well as its proprietary Operating Room for the 21st Century SM concept. AMS owns a common stock investment in Mevion Medical Systems, Inc., developer of the compact MEVION S250 TM Proton Therapy System. Safe Harbor Statement This press release may be deemed to contain certain forward-looking statements with respect to the financial condition, results of operations and future plans of American Shared Hospital Services (including statements regarding the expected demand for Gamma Knife services in Peru) which involve risks and uncertainties including, but not limited to, the risks of variability of financial results between quarters, the risks of the Gamma Knife and radiation therapy businesses, the risks of developing The Operating Room for the 21st Century program, the risks of investing in Mevion Medical Systems, Inc., and the risks of the timing, financing, and operations of the Company's proton therapy business. Further information on potential factors that could affect the financial condition, results of operations and future plans of American Shared Hospital Services is included in the filings of the Company with the Securities and Exchange Commission, including the Company's Annual Report on Form 10-K for the year ended December 31, 2016, its Form 10-Q for the three months ended March 31, 2017, and the definitive Proxy Statement for the Annual Meeting of Shareholders held on June 27, 2017.