Supratentorial Acute Subdural Hematoma During Fully Endoscopic Microvascular Decompression Surgery for Hemifacial Spasm

The endoscope has been widely used in microvascular decompression (MVD), which is the best curative treatment for hemifacial spasm. Supratentorial subdural hematoma (SDH) is rarely happened in MVD. The authors report 2 cases of SDH during full endoscopic MVD. The origin of bleeding is not confirmed during the operation. Rapid and excessive drainage of cerebrospinal fluid and the operation position may result the rupture of bridging veins, which result in the occurrence of SDH. However, there is no clear evidence to explain the clinical symptoms.