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Diagnostic method for differentiating external hydrocephalus from simple subdural hygroma.
Pil-Woo Huh1, Do-Sung Yoo, Kyung-Suok Cho
1Department of Neurosurgery, Uijeongbu St. Mary's Hospital, The Catholic University of Korea, College of Medicine, Uijeongbu-City, Gyeonggi-do, Korea.
Journal of Neurosurgery
|July 29, 2006
Summary
Subdural pressure monitoring helps distinguish external hydrocephalus from subdural hygroma after mild head trauma. The modified frontal horn index (mFHI) also aids in assessing subdural fluid collection.
Area of Science:
- Neuroscience
- Neurosurgery
- Radiology
Background:
- Subdural fluid collections after mild head trauma are often ambiguously diagnosed using terms like external hydrocephalus and subdural hygroma.
- Differentiating these conditions is clinically challenging but crucial for appropriate management.
Purpose of the Study:
- To present a diagnostic method for differentiating external hydrocephalus from simple subdural hygroma.
- To establish a clear distinction between these two entities based on clinical experience.
Main Methods:
- Twenty patients with subdural fluid collection post-mild head trauma were studied.
- Ventricle size was assessed using a modified frontal horn index (mFHI).
- Subdural pressure was measured during bur hole trephination, with surgery indicated for collections >15 mm, persistent, or symptomatic.
Main Results:
- Subdural pressure ranged from 3 to 27.5 cm H2O.
- Four patients with subdural pressure >15 cm H2O developed hydrocephalus post-surgery (p < 0.05).
- Preoperative enlarged ventricles (mFHI > 33%) were observed in patients who developed hydrocephalus.
Conclusions:
- Monitoring subdural pressure is a valuable tool for differentiating subdural hygroma from external hydrocephalus.
- The mFHI provides a more accurate assessment of subdural collection nature than the standard frontal horn index.