Table 1.

The CIRSE classification of interventional radiology complications

Grade	Description
1	Complication during the procedure which could be solved within the same session, no additional therapy, no post procedure sequalae, no deviation from the normal post therapeutic course
2	Prolonged observation (including overnight stay as a deviation from the normal post-operative course <48 h); no additional post procedure therapy, no post procedure sequalae
3	Additional post-procedure therapy or prolonged hospital stay (>48 h) required; no post-procedure sequalae
4	Complication causing a permanent mild sequalae (resuming work and independent living)
5	Complication causing severe permanent sequalae (requiring ongoing assistance in daily life)
6	Death