A 70-year-old man presented to our hospital because of difficulty with discrete movement of the right upper limb and dysarthria. Computed tomography(CT)of the head revealed a chronic subdural hematoma(CSDH)on the left side. The patient underwent single burr-hole irrigation and drainage on the same day. In addition to the burr hole, a cross-shaped dural incision was made which revealed a thick outer membrane and solidified hematoma. We removed as much of the clotted hematoma as possible using a curved suction tube under neuroendoscopy. The postoperative CT revealed that the hematoma was partially removed and the mass effect was reduced. As a result, the patient's neurological deficits improved. We reached a diagnosis of organizing CSDH following histologic examination of the removed hematoma that showed inflammatory cell infiltration and multiplication of fibroblasts. Neuroendoscopic hematoma evacuation via a burr hole is minimally invasive and may be a useful procedure in the treatment of some cases of organizing CSDH.
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