Orphanet Journal of Rare Diseases | MRI Study on Cerebrovascular Involvement in Patients with Hereditary Spherocytosis

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This study systematically evaluated whether cerebrovascular abnormalities exist in patients with Hereditary Spherocytosis (HS) at a young age, using a large observational cohort and case-control MRI analysis. The results showed no significant differences in cerebrovascular abnormalities between HS patients and healthy controls, challenging previous recommendations for regular brain imaging monitoring in HS patients.

 

Literature Overview

The article titled In spite of an evocative case-report-based Literature, early cerebrovascular involvement is not increased in Hereditary Spherocytosis, making MR brain parenchymal and vascular monitoring unnecessary in neurologically asymptomatic patients, published in the journal Orphanet Journal of Rare Diseases, reviewed and summarized existing literature regarding whether Hereditary Spherocytosis (HS) increases the risk of cerebrovascular events at a young age. It also assessed HS patients for cerebrovascular abnormalities through clinical investigation and 3T-MRI scans. The study found no significant cerebrovascular events before age 55 in HS patients, no significant arterial stenosis, cerebral infarction, or venous sinus thrombosis on MRI, and no difference in white matter lesions between HS and healthy controls. The findings challenge the traditional view that early brain imaging is necessary for HS patients.

Background Knowledge

Hereditary Spherocytosis (HS) is a hereditary hemolytic anemia caused by red blood cell membrane defects, mainly presenting with spherocytosis, jaundice, and splenomegaly. Patients often undergo splenectomy due to severe hemolysis, which may increase thrombotic risk. Some literature has suggested a potential link between HS and cerebrovascular diseases (e.g., moyamoya disease, cerebral artery stenosis, cerebral infarction), but systematic studies are lacking. Additionally, HS shares some pathophysiological mechanisms with sickle cell disease, which is known to cause cerebrovascular lesions. Thus, it remains unclear whether HS also carries cerebrovascular risks. This study systematically assessed early cerebrovascular abnormalities in HS patients using a large clinical cohort and imaging analysis, and explored potential associations between splenectomy and cerebrovascular disease.

 

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Research Methods and Experiments

The study included 190 HS patients, of whom 69 underwent 3T-MRI scans (including brain parenchymal and cerebrovascular imaging), and 56 healthy volunteers served as controls. Researchers collected cerebrovascular event histories via telephone interviews and medical record reviews, and evaluated cerebral artery stenosis, aneurysms, cerebral infarction, venous sinus thrombosis, and white matter lesions using MRI. The 3T-MRI protocol included FLAIR, DWI, TOF-MRA, and phase-contrast venous imaging, all assessed blindly by three neuroradiologists. Statistical analyses used two-tailed t-tests, Mann-Whitney U tests, and chi-square tests to assess differences between HS patients and healthy controls.

Key Findings and Insights

• In the cohort of 190 HS patients and their first-degree relatives, no cerebrovascular events were recorded before age 55, with only one 43-year-old HS patient dying from unknown causes.
• In the MRI subgroup, no significant differences were found between HS patients (n=69) and healthy controls (n=56) in terms of aneurysms, cerebral infarction, venous sinus thrombosis, or white matter lesions.
• PHASES scores indicated that all aneurysms had a rupture risk ≤5, with a 5-year rupture risk ≤1.3%, suggesting low aneurysm risk in HS patients.
• White matter lesions (WML) were present in both HS patients and healthy controls, with no significant difference in Fazekas scores (49.3% vs 50%).
• No HS patient was diagnosed with moyamoya disease or cerebral artery stenosis, and WML was not significantly associated with laboratory or clinical parameters.
• Age was a significant factor for WML, but gender and splenectomy history were not significantly associated with WML in HS patients.
• The results challenge previous recommendations for early cerebrovascular imaging in HS patients, suggesting routine MRI monitoring may not be necessary.

Significance and Future Directions

This study is the first to systematically assess cerebrovascular abnormalities in HS patients without neurological symptoms. It suggests that early cerebrovascular event risk in HS patients is comparable to the general population, with no significant arterial or venous abnormalities. The findings provide new evidence for clinical management and recommend against unnecessary imaging monitoring in asymptomatic HS patients. Future studies with larger samples and multicenter designs are needed to further validate the utility of MRI in HS, and to explore potential individualized imaging evaluation strategies.

 

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Conclusion

By analyzing 190 HS patients, including 69 adults who underwent MRI, and 56 healthy controls, this study systematically evaluated the incidence of early cerebrovascular disease in HS. The results showed no cerebrovascular events in HS patients before age 55, and no moyamoya disease, cerebral artery stenosis, or venous sinus thrombosis on MRI. There were no significant differences in cerebral aneurysms or white matter lesions between HS patients and healthy controls, and WML was not associated with splenectomy, hemolysis, or laboratory parameters. The findings challenge previous recommendations for early imaging monitoring in HS patients, suggesting that routine cerebrovascular MRI may be unnecessary in neurologically asymptomatic HS individuals. These results provide new evidence for the clinical management of HS patients and may influence future diagnostic and therapeutic guidelines.

 

Renzo Manara, Marcella Contieri, Giovanni Librizzi, Silverio Perrotta, and Immacolata Tartaglione. Cerebrovascular involvement in hereditary spherocytosis: observational cohort and case-control MRI study. Orphanet Journal of Rare Diseases.