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[Ultrastructural systematization of vascular changes in gliomas]
Zentralblatt Fur Allgemeine Pathologie U. Pathologische Anatomie
|January 1, 1986
Summary
Benign gliomas show altered microcirculation, with fewer arterioles and abnormal capillaries/venules. These changes may contribute to brain swelling (edema) by disrupting fluid and ion transport.
Area of Science:
- Neuropathology
- Neurovascular Research
- Oncology
Background:
- Microcirculation in benign gliomas (astrocytomas, oligoastrocytomas grades I-II) is poorly understood compared to glioblastomas.
- Understanding these vascular changes is crucial for diagnosing and managing brain tumors.
Purpose of the Study:
- To investigate and classify the fine structural features of arterioles, capillaries, and venules in benign gliomas.
- To compare the microcirculation of benign gliomas with normal brain parenchyma.
Main Methods:
- Electron microscopy was used to examine 36 cases of astrocytomas and oligoastrocytomas (grades I and II).
- Detailed analysis of small vessel architecture, including basement membranes and perivascular spaces.
Main Results:
- Benign gliomas exhibited a reduced number of arterioles compared to normal brain tissue.
- Thickening of the subendothelial basement membrane was consistently observed.
- Transitional vessel forms, termed "capillary-like" and "venule-like," were identified, with venule-like vessels being more numerous.
- Dilated pericapillary and perivenular spaces, along with incomplete astrocytic sheaths, were noted.
- Glial processes lacking basement membranes were found in perivascular spaces.
Conclusions:
- The observed microvascular abnormalities in benign gliomas, including arteriole scarcity and altered capillary/venule structures, may impair autoregulation.
- Pathological vessel structures can lead to disrupted water and ion transport, potentially causing brain edema.