Questione giuridica chiave
Whether the requirements for revising the existing disability pension under Art. 17 ATSG were met.
Decisione estratta
No material change in the claimant's factual circumstances, especially health, was shown after the original pension award.
Motivazione estratta
A revision requires proof of changed actual circumstances after the final original decision; the prior pension award cannot be reopened through revision. The medical records did not clearly show a relevant deterioration.