Questione giuridica chiave
Whether the IV office and cantonal court unlawfully denied a revision-based increase of the quarter pension without sufficient medical clarification.
Decisione estratta
The refusal could not stand because the medical record on the psychiatric situation was unclear and further investigations were required.
Motivazione estratta
The RAD report was not enough to resolve an unclear psychiatric situation; the office could not reject the claimed deterioration as insufficiently proven while also declining any further clarification. In a revision case, once a change is made plausible, the authority must investigate the facts fully.