Kernrechtsfrage
Whether the pension could be withdrawn based on a material change in health under Art. 17 LPGA.
Extrahierter Entscheid
The withdrawal could not be confirmed on the present record because the psychiatric expertise was not sufficiently probative; a new expert assessment is required.
Extrahierte Begründung
The expert report lacked a coherent overall analysis, had a superficial history, and contained polemical remarks casting doubt on impartiality, so it could not reliably establish improvement.