Table 1.

Dural Tears Adverse Occurrence (AO)

Dural Tear Complications	Prevalence
unintended dural opening The dura was inadvertently opened during the procedure, with CSF extravasation or bulging of the arachnoid layer.	161 (10%)
CSF leak The patient developed a leak of cerebrospinal fluid from the skin incision after the procedure, requiring additonal diagnostic tests, or requiring prolongation of wound care or bed rest or antibiotics, or requiring lumbar drain placement, or requiring repeat surgery. Criteria: (1) clear liquid draining from incision with beta-transferrin present in fluid or CSF symptoms (postural headache OR posterior neck pain or stiffness OR nausea OR photosensititivty OR visual symptoms OR tinnitus OR vertigo); AND (2) paraspinal spinal fluid collection on imaging studies; AND (3) requires treatment (bed rest, drain, or surgery).	14 (0.88%)

Dural Tear Complications

Prevalence

unintended dural opening
The dura was inadvertently opened during the procedure, with CSF extravasation or bulging of the arachnoid layer.

161 (10%)

CSF leak
The patient developed a leak of cerebrospinal fluid from the skin incision after the procedure, requiring additonal diagnostic tests, or requiring prolongation of wound care or bed rest or antibiotics, or requiring lumbar drain placement, or requiring repeat surgery. Criteria: (1) clear liquid draining from incision with beta-transferrin present in fluid or CSF symptoms (postural headache OR posterior neck pain or stiffness OR nausea OR photosensititivty OR visual symptoms OR tinnitus OR vertigo); AND (2) paraspinal spinal fluid collection on imaging studies; AND (3) requires treatment (bed rest, drain, or surgery).

14 (0.88%)