An autopsy case of encapsulated acute subdural hematoma presenting as an acute-on-chronic spontaneous subdural hematoma
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Updated: Jul 6, 2026

Double Direct Injection of Blood into the Cisterna Magna as a Model of Subarachnoid Hemorrhage
Published on: August 30, 2020
Kazuhisa Funayama1, Akihide Koyama1, Rieka Katsuragi-Go1
1Division of Legal Medicine, Department of Community Preventive Medicine, Niigata University Graduate School of Medicine and Dental Sciences, Niigata, Japan; Center of Cause of Death Investigation, Faculty of Medicine, Niigata University, Niigata, Japan.
Abstract:
Subdural hematoma (SDH) is bleeding between the dura mater and the brain surface, often visualized as a crescent-shaped lesion on computed tomography (CT). However, some SDHs can appear as a biconvex hyperdense lesion mimicking an acute epidural hematoma. Encapsulated acute SDH (EASDH), a rare subtype characterized by a fresh hematoma within the subdural fibrous capsule, presents with similar CT findings. Herein, we describe an autopsy case of EASDH and discuss its etiology based on the case findings and available literature. The autopsy revealed a rupture of the bridging arteries as the SDH bleeding source, confirming the development of an acute-on-chronic spontaneous SDH. To our knowledge, this is the first autopsy report of EASDH and the third case of spontaneous SDH due to bridging-artery rupture.
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