Gamma Knife Perfexion System Supplied by American Shared Hospital Services Begins Treating Patients at Bryan Medical Center in Nebraska

American Shared Hospital Services AMS, a leading provider of turnkey technology solutions for advanced radiosurgical and radiation therapy services, announced today that physicians have begun treating patients with the Gamma Knife® Perfexion™ system AMS supplied to Bryan Medical Center, Lincoln, Nebraska.

AMS Chairman and Chief Executive Officer Ernest A. Bates, M.D. said, "The initiation of Gamma Knife Perfexion treatments at Bryan Medical Center brings new hope to brain tumor, trigeminal neuralgia and vascular malformation patients in the Lincoln, Nebraska area. This is the eighteenth Gamma Knife in AMS' portfolio, and as always, we are pleased to make it possible for additional cancer patients to benefit from this advanced therapeutic technology."

About Bryan Medical Center

Bryan Medical Center is a 640-bed, non-profit, locally owned, healthcare organization serving patients throughout Nebraska, as well as parts of Kansas, Iowa, South Dakota and other states in the region. Bryan Medical Center includes two acute care facilities (Bryan East Campus and Bryan West Campus) and many outpatient clinics. Premier services include cardiology, neuroscience, orthopedics, vascular, a Level II Trauma Center, emergency departments, intensive care, women's and children's health, a Level III NICU, imaging and mental health. Bryan Medical Center also offers inpatient rehabilitation, mobile diagnostics and treatment, gastroenterology, oncology, urology, nephrology, pulmonary and general medicine, robotic assisted surgery and a comprehensive bariatrics program.

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, and the latest IGRT and IMRT systems. AMS owns a common stock investment in Mevion Medical Systems, Inc., developer of the compact MEVION S250 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 continued growth in volume of the MEVION S250 system, the expansion of the Company's proton therapy business, and the timing of treatments by new Gamma Knife systems) 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 Quarterly Reports on Form 10-Q for the three months ended March 31, 2017 and June 30, 2017, and the definitive Proxy Statement for the Annual Meeting of Shareholders held on June 27, 2017.

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