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Electron microscopic study on the outer membrane of chronic subdural hematoma
1Department of Neurosurgery, Kaohsiung Medical College, Taiwan, Republic of China.
Abstract:
We studied the electron microscopic features of the outer membrane of chronic subdural hematoma to explore the mechanism of growth of chronic subdural hematoma. Ultrastructurally, the outer membrane consisted of bundles of collagen fibrils and cellular elements such as fibroblasts, mast cells, migrating erythrocytes, platelets and eosinophils. A large number of proliferating macrocapillaries coursed among them. Such general characteristics of the endothelial cells with proliferating macrocapillaries as gap junctions and thinness or absence of the basement membrane suggested that they be very fragile and susceptible to bleeding. The number and extent of endothelial gap junctions indicated that they could account for most of the leakage not only into the tissue of the outer membrane but also into the hematoma cavity. The outer membranes had a prominent infiltration of eosinophils. Plasminogen secreted by the eosinophils inhibits the formation of platelet thrombus within the lumen and also dissolves fibrinoid substance, which reinforces fragile endothelial walls or edematous interstitium. These features possibly contribute to the recurring hemorrhage from the vessels in the outer membrane and the resultant enlargement of the hematoma.
Insights
The outer membrane of chronic subdural hematomas contains fragile capillaries and eosinophils. Eosinophil secretions may promote bleeding, contributing to hematoma growth.
Area of Science:
- Neuropathology
- Vascular Biology
- Cellular Biology
Background:
- Chronic subdural hematoma (CSH) growth mechanisms remain incompletely understood.
- The outer membrane plays a critical role in CSH pathogenesis.
Purpose of the Study:
- To investigate the ultrastructural features of the CSH outer membrane.
- To elucidate the cellular and molecular mechanisms driving CSH expansion.
Main Methods:
- Electron microscopy was employed to examine the outer membrane of CSH.
- Cellular components and vascular structures were analyzed ultrastructurally.
Main Results:
- The outer membrane comprises collagen fibrils, fibroblasts, mast cells, erythrocytes, platelets, and eosinophils.
- Proliferating macrocapillaries with thin or absent basement membranes and numerous gap junctions were observed, indicating fragility.
- Significant eosinophil infiltration was noted, with secreted plasminogen potentially inhibiting thrombus formation and dissolving fibrinoid substances.
Conclusions:
- Fragile capillaries and gap junctions in the outer membrane contribute to leakage and hematoma enlargement.
- Eosinophil activity, specifically plasminogen secretion, may impede hemostasis and promote recurrent hemorrhage, driving CSH growth.