To the Editor: We read the article by Soleman et al1 with great interest which provides information to support hierarchy-based evidence. The authors of the research group needs to be congratulated to undertake research on a very commonly performed neurosurgical procedure and try to address the issues related to placement of drain in these cases.1 Some questions that arise in the placement of subudral drains are: 1. How much distance from the burr hole should the catheter be inserted?; 2. Does the direction of placement of the catheter influence the volume evacuated?; and 3. Is the solution irrigation a strategy to reduce the recurrence of the hematoma? Additionally, based on the results of the cSDH-Drain Trial, we propose 3 classes of patients: 1. Patients with cSDH without coagulopathy, without septations; 2. Patient with SDH with septations; 3. Patient with cSHD anticoagulated. type 1 will be the ideal patient who would undergo an SPD, patients type 2 will be more prone to more aggressive strategies (membranectomy) patients type 3 may be candidates for SPD with increased risk of complications. We believe that the results from the present study will be useful to make a decision whether and where to place a drain following removal of chronic subdural hematoma. Disclosures The authors have no personal, financial, or institutional interest in any of the drugs, materials, or devices described in this article.