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Histopathological evaluation of polymethyl methacrylate as an embolic agent
V V Radhakrishnan1, A Saraswathy, V R Rao
1Department of Pathology, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum, India.
Abstract:
Polymethyl methacrylate (PMMA) microspheres were used as an embolic agent to reduce the vascularity in eight patients with intracranial vascular tumours. Post embolization angiograms showed 30-60% reduction in the vascularity of the tumours. No patient developed any neurological complications in the immediate post-embolization period. These eight patients subsequently underwent surgery for the removal of their tumours. During surgery there was minimal blood loss and a good plane of cleavage was obtained between the tumour and the adjacent brain. The surgical specimens were examined histopathologically for the effects of PMMA. PMMA microspheres, in contrast to other cyanoacrylates--isobutyl-2-cyanoacrylate (IBCA)--did not elicit either inflammatory reaction or mural angionecrosis within the wall of the embolised vessels. The histopathological studies suggest that PMMA microspheres are an inert material and can be used as an adjunct in the management of intracranial vascular tumours.
Insights
Polymethyl methacrylate (PMMA) microspheres effectively reduced vascularity in brain tumors, leading to minimal blood loss during surgery. Histopathology confirmed PMMA microspheres are inert, showing no adverse reactions in embolized vessels.
Area of Science:
- Neurosurgery
- Interventional Radiology
- Biomaterials Science
Background:
- Intracranial vascular tumors pose significant surgical challenges due to high vascularity.
- Effective pre-surgical embolization is crucial to minimize intraoperative blood loss and improve surgical outcomes.
- Previous embolic agents have shown limitations, including inflammatory reactions and vascular damage.
Purpose of the Study:
- To evaluate the safety and efficacy of polymethyl methacrylate (PMMA) microspheres as an embolic agent for intracranial vascular tumors.
- To assess the histopathological effects of PMMA microspheres on embolized vessels.
- To determine the impact of PMMA embolization on subsequent surgical tumor resection.
Main Methods:
- Eight patients with intracranial vascular tumors underwent embolization using PMMA microspheres.
- Post-embolization angiography was performed to assess vascularity reduction.
- Patients subsequently underwent surgical tumor removal.
- Histopathological examination of surgical specimens analyzed the effects of PMMA on vessel walls.
Main Results:
- Angiography demonstrated a 30-60% reduction in tumor vascularity post-embolization.
- No immediate neurological complications were observed in any patient.
- Surgery revealed minimal blood loss and a clear plane of cleavage between tumor and brain.
- Histopathology showed PMMA microspheres were inert, without inflammatory reactions or mural angionecrosis, unlike isobutyl-2-cyanoacrylate (IBCA).
Conclusions:
- PMMA microspheres are a safe and effective embolic agent for reducing vascularity in intracranial tumors.
- PMMA microspheres exhibit favorable biocompatibility, lacking the adverse inflammatory and necrotic effects seen with other agents.
- PMMA microspheres serve as a valuable adjunct, improving surgical outcomes for intracranial vascular tumors.