Submitted on: 07 February 2000.
Revised on: 07 March 2000.
Accepted on: 30 March 2000.
___________________BJR Case Reports---BRITISH INST RADIOLOGY
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Submitted on: 11 August 2001.
Revised on: 03 October 2001.
Accepted on: 20 November 2001.
___________________BJR Case Reports---BRITISH INST RADIOLOGY