Remote Cerebellar Hemorrhage after Supratentorial Burr-Hole Trepanation for Unilateral Chronic Subdural Hematoma: Case Report.

Remote cerebellar hemorrhage (RCH) after burr-hole evacuation for chronic subdural hematoma (cSDH) is a rare and uncommon complication of minor supratentorial surgery with very few reports in the literature and an uncertain etiology. We present the case of a 62-year-old male who underwent single burr-hole trepanation for unilateral cSDH, revealing incidental RCH on routine postoperative computed tomography (CT) scan most likely resulting from overdrainage of cerebrospinal fluid (CSF) within the postoperative period. The patient recovered well without further neurosurgical intervention. Intra- and postoperative drainage of large volumes of CSF and the venous origin of the bleeding are accepted factors in the controversial concept of its pathophysiology. Alterations in transtentorial pressure and stretching of superficial cerebellar veins with consequent rupture seem to constitute a useful concept, although details on mechanical or hemodynamic changes still remain unknown. A multifactorial etiology with CSF-overdrainage as the major main factor seems reasonable. Neurosurgeons should be aware of the possibility of RCH even in minor supratentorial procedures such as simple burr-hole trepanation. There is a tendency towards more benign courses, but higher patient age and severity of RCH correlate with a poor outcome. Early diagnosis of RCH and close monitoring reduce unnecessary diagnostic and therapeutic interventions in these patients, probably affecting morbidity and mortality.