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Property and Equipment
12 Months Ended
Dec. 31, 2018
Property and Equipment [Abstract]  
Property and Equipment
Note F – Property and Equipment

Property and equipment are as follows:

  
2018
  
2017
 
       
Gamma knife
 
$
-
  
$
5,337,000
 
Leasehold improvements
  
-
   
2,138,000
 
Less: Depreciation and amortization
  
-
   
(3,748,000
)
         
  
$
-
  
$
3,727,000
 

Depreciation expense for the years ended December 31, 2018 and 2017 was $754,000 and $830,000 respectively.  Amortization expense for the years ended December 31, 2018 and 2017 was $229,000 and $305,000 respectively.

Effective October 1, 2018, when the NYU agreement was determined to be a to be a sales-type sublease between USN, the lessor, and NYU, the lessee, all of the property and equipment held by the Company was derecognized (Note E). As a result, no assets included in property and equipment remain on the Company’s Consolidated Balance Sheet at December 31, 2018.