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Contralateral Progression after Unilateral Surgery for Bilateral Chronic Subdural Hematoma: A Prospective
Kenji Yagi1, Yasukazu Hijikata2, Yoshifumi Tao1
1Department of Neurosurgery, Kawasaki Medical School, Kurashiki.
Neurologia Medico-Chirurgica
|March 25, 2025
Summary
Predictors for contralateral chronic subdural hematoma progression after unilateral surgery were identified. Membranous hematoma type and smaller volume indicate a lower risk, suggesting selective unilateral surgery for bilateral chronic subdural hematoma.
Area of Science:
- Neurosurgery
- Neurology
- Radiology
Background:
- Bilateral chronic subdural hematoma (CSDH) management involves burr-hole surgery, with options for simultaneous bilateral or staged unilateral procedures.
- Contralateral CSDH progression after initial unilateral surgery is a concern, yet its predictors and optimal surgical strategies remain unclear.
- Understanding factors influencing contralateral CSDH progression is crucial for refining surgical decision-making in bilateral CSDH cases.
Purpose of the Study:
- To identify preoperative predictors of contralateral chronic subdural hematoma progression following unilateral surgery in patients with bilateral CSDH.
- To specifically investigate the role of contralateral CSDH characteristics, such as membranous type and hematoma volume, in predicting progression.
Main Methods:
- Prospective observational study including 39 patients with bilateral CSDH undergoing initial unilateral burr-hole surgery.
- Patients were monitored for contralateral CSDH progression, necessitating further surgery if observed.
- Preoperative factors, including CSDH type (membranous vs. non-membranous) and volume, were analyzed using logistic regression.
Main Results:
- Contralateral CSDH progression occurred in 16 out of 39 patients (41%), requiring subsequent contralateral surgery.
- Membranous-type CSDH on the contralateral side was associated with a significantly lower risk of progression (OR 0.07; 95% CI: 0.01-0.65).
- Increased preoperative contralateral CSDH volume was a significant risk factor for progression (OR 1.58 per 10 mL increase; 95% CI: 1.04-2.40).
Conclusions:
- Membranous CSDH type and smaller contralateral hematoma volume are associated with a reduced risk of progression after unilateral surgery.
- These findings suggest that unilateral surgery may be a selective and safe option for bilateral CSDH patients with these specific characteristics.
- Further research can refine surgical strategies for bilateral CSDH based on these identified predictive factors.
