Table 4. Damaging Events in the Invasive Procedure-related Cases.

	Damaging events
Of the spine: neuraxial (n = 16)
Cervical epidural block	Pneumocephalus (1), high block/total spinal (1)
Cervical root block	Intravascular injection (1)
Lumbosacral epidural block	Intracranial hemorrhage (1), cerebral infarction (1), postdural puncture headache (2), meningitis (1), abscess (1), intravascular injection (1), sensorimotor deficit of unclear cause (3), pre-existing injury (1)
Epiduroscopy	Meningitis (1), sensorimotor deficit of unclear cause (1)
Of the spine: non-neuraxial (n =4)
Vertebroplasty	Pulmonary embolism (1), hematoma (1)
Facet joint block	Needle trauma to the nerve (1), intravascular injection (1)
Of the head and neck (n = 2)
IMS	Subdural hematoma (1)
Prolotherapy	High block/total spinal (1)
Of the upper extremities including shoulder (n = 2)
IMS	Pneumothorax (1)
Suprascapular nerve block	Intravascular injection (1)
Of the trunk (n = 3)
Intercostal nerve block	Dissatisfaction with the treatment outcomes (1)
Psoas compartment block	Hemoperitoneum (1), renal hematoma (1)
Of the lower extremities (n = 2)
Femoral nerve block	Hematoma (1)
Intra-articular injection	Infection (1)

Values indicate the number of cases.