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Internal carotid artery occlusion in a child with sickle cell disease: case report and immunohistochemical study
A M Tuohy1, V McKie, E A Manci
1Department of Pediatrics, Medical College of Georgia, Augusta 30912, USA.
Insights
Acute thrombosis of internal carotid arteries in a child with sickle cell disease caused massive brain infarction. Minimal intimal hyperplasia, not thrombus, characterized the arterial lesion, suggesting smooth muscle cell proliferation is key.
Area of Science:
- Neurology
- Pathology
- Pediatrics
Background:
- Sickle cell disease is a known risk factor for cerebrovascular events in children.
- Internal carotid artery (ICA) thrombosis is a rare but devastating complication.
Observation:
- A case report detailing extensive brain vessel pathology in a child with sickle cell disease.
- Massive cerebral infarction and edema were observed.
- Acute thrombus occluded both ICAs, with minimal intimal hyperplasia in the left ICA.
Findings:
- The intimal hyperplasia in the ICA was characterized by proliferative vascular smooth muscle cells.
- This suggests smooth muscle cell stimulation, rather than endothelial dysfunction, may drive sickle cell-related vasculopathy.
- Acute thrombus formation occurred despite minimal intimal hyperplasia.
Implications:
- Findings challenge existing understanding of sickle cell vasculopathy mechanisms.
- Highlights the potential role of smooth muscle cell proliferation in acute cerebral artery thrombosis.
- Suggests novel therapeutic targets for preventing stroke in pediatric sickle cell disease.
Purpose:
The purpose of this report is to describe the clinical and pathologic features of a patient with acute thrombosis of both internal carotid arteries leading to death.
Methods:
This is a case report of special interest because of extensive brain vessel pathologic examination.
Results:
The analysis of this case showed that the brain had suffered massive infarction and cerebral edema. The internal carotid arteries (ICAs) were occluded by acute thrombus. The arterial wall of the left ICA, studied at its distal segment, showed a small amount of intimal hyperplasia which did not cause encroachment on the lumen. Immunohistochemical stains indicated that this lesion was formed by proliferative vascular smooth muscle rather than incremental thrombus formation.
Conclusion:
Acute thrombus formation can occur in the large cerebral arteries of children with sickle cell disease in the presence of only minimal intimal hyperplasia. The intimal hyperplasia which forms the sickle related vasculopathy seen on angiography or detected by Transcranial Doppler may be more related to stimulation of smooth muscle cells than dysregulation of thromboregulation at the endothelial surface. Implications for preventive treatment are discussed.