Gamma Knife Perfexion System Supplied by American Shared Hospital Services Begins Treating Patients at Northern Westchester

  Gamma Knife Perfexion System Supplied by American Shared Hospital Services
  Begins Treating Patients at Northern Westchester Hospital in Mt. Kisco, New
  York

Business Wire

SAN FRANCISCO -- June 5, 2013

AMERICAN SHARED HOSPITAL SERVICES (NYSE MKT: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^TM system it supplied to Northern Westchester
Hospital in Mt. Kisco, New York.

AMS Chairman and Chief Executive Officer Ernest A. Bates, M.D., said, "This
Perfexion system, the fourteenth in our portfolio, is an upgrade to the Gamma
Knife system we originally supplied to Northern Westchester Hospital in 2005.
We are glad that our creative financing solutions have made it possible to
bring the latest advances in stereotactic radiosurgery to cancer patients
throughout the greater Hudson Valley region."

Adele Gargano, Director of the Cancer Treatment and Wellness Center at
Northern Westchester Hospital, said, "This Perfexion system is a significant
addition to our Cancer Treatment and Wellness Center. We are pleased to
partner with American Shared Hospital Services to offer the latest Gamma Knife
technology, and proud that Northern Westchester is the first hospital in the
Hudson Valley region to offer the Perfexion system for the treatment of brain
tumors, trigeminal neuralgia, and other malformations within the brain."

About Gamma Knife Perfexion

Gamma Knife Perfexion maintains full clinical compatibility with the classic
Gamma Knife and is supported by efficacy and outcome data from 600,000 treated
patients worldwide and thousands of peer-reviewed scientific articles, making
it a proven choice for radiosurgery of the brain. Elekta estimates that the
fully automated and efficient single push-button approach can save 3-5 working
weeks of physician time per year at an average Gamma Knife center.

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 the latest IGRT and IMRT
systems, as well as its proprietary Operating Room for the 21st Century^SM
concept. AMS owns a preferred 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, which involve risks and
uncertainties including, but not limited to, the risks of the Gamma Knife and
radiation therapy businesses, the risks of developing The Operating Room for
the 21st Century program, and the risks of investing in a development-stage
company, Mevion Medical Systems, Inc., without a proven product. 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, 2012, the Quarterly Report on form 10-Q for the quarter
ended March 31, 2013, and the definitive Proxy Statement for the Annual
Meeting of Shareholders to be held on June 11, 2013.

Contact:

American Shared Hospital Services
Ernest A. Bates, M.D., (415) 788-5300
Chairman and Chief Executive Officer
e.bates@ashs.com
Berkman Associates
Neil Berkman, (310) 477-3118
President
info@berkmanassociates.com
 
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