Table 6. SIR definition and grading system of complications.

Classification	Definition
Adverse reaction	Pain
	Post-ablation syndrome
	Asymptomatic pleural effusion
	Injury of the adjacent structures but without any consequence
Minor complications	No therapy, no consequence
	Nominal therapy, no consequence; includes overnight admission for observation only
Major complications	Require therapy, minor hospitalization (<48 hours)
	Require major therapy, unplanned increase in level of care, prolonged hospitalization (>48 hours)
	Permanent adverse sequelae
	Death

SIR, Society of Interventional Radiology (US).