Factors Predicting Recurrence and Resolution of Chronic SDH after Surgery.

 Chronic subdural hematoma (SDH) is notoriously known to have high recurrence rates after surgery. We followed the course of 100 postoperative patients to determine the various stipulated factors associated with recurrence.  In our study of 100 patients, there was a significant association with the size of SDH, amount of midline shift, increasing age, less duration of primary injury, and the increasing incidence of delayed resolution and recurrence. Also, the membrane of the patients with recurrent SDH was found to have a collection of neutrophils, plasma cells, histiocytes, and lymphocytes.  Large size of SDH, increasing age, and recent injury were significant determining factors for delayed resolution and recurrence.