Whether the requirements for revising and suppressing the disability pension under Art. 17 LPGA were met.
No material change in circumstances was sufficiently demonstrated; the later expertise did not establish a properly dated and compared improvement.
Revision requires a clear, medically substantiated change compared with the situation at the time of the original pension award. The expert report lacked a comparison between the two relevant moments and did not show when any improvement occurred; the file therefore did not support suppression of the pension.