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Updated: May 24, 2026

Double Direct Injection of Blood into the Cisterna Magna as a Model of Subarachnoid Hemorrhage
Published on: August 30, 2020
Chronic subdural hematoma associated with arachnoid cyst. Two case histories with pathological observations
Takeshi Takayasu1, Kunyu Harada, Shigeru Nishimura
1Department of Neurosurgery, Kitakyushu General Hospital, Kitakyushu, Fukuoka, Japan. ttakayasu-nsu@umin.ac.jp
Abstract:
Arachnoid cysts are well known to induce chronic subdural hematoma (CSDH) after head injury. However, histological observations of the arachnoid cyst and hematoma membrane have only been rarely described. An 8-year-old boy and a 3-year-old boy presented with CSDH associated with arachnoid cyst. Surgical removal of the hematoma and biopsy of the hematoma membrane and cyst wall were performed. Clinical courses were good and without recurrence more than 1.5 years after surgery. Histological examination suggested that the cysts did not contribute to hematoma development. Pediatric hematoma membranes, similar to adult hematoma membranes, are key in the growth of CSDH. Therefore, simple hematoma evacuation is adequate as a first operation for CSDH associated with arachnoid cyst.
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