The number of burr holes and use of a drain do not interfere with surgical results of chronic subdural hematomas.

Unlabelled: Burr hole evacuation has been the most frequently-used procedure for the treatment of chronic subdural hematomas (CSDH).

Objective: To evaluate whether the use of a drain and/or the number of burr holes for treatment of CSDH modifies the rates of recurrence and complications.

Methods: A retrospective review of 142 patients operated on because of CSDH, between 2006 and 2015, analyzing recurrence and complications of the use of one or two burr holes with or without the use of a drain.