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Journal of Korean Neurosurgical Society 2007;41(6): 371-376.
Preoperative Assessment of Cystic Brain Lesion: Significance of Diffusion-Weighted Image and ADC (Apparent Diffusion Coefficiency) Values.
Hyun Chul Choi, Sang Won Lee, Cheol Ji
1Department of Neurosurgery, St. Paul's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea. cji@catholic.ac.kr
2Department of Neurosurgery, St. Vincent Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea.
ABSTRACT
OBJECTIVE
S: The aim of this study was to investigate the usefulness of diffusion-weighted imaging (DWI) and apparent diffusion coefficiency (ADC) in distinguishing brain abscesses from cystic or necrotic brain tumors, which are difficult to be differentiated by conventional magnetic resonance imaging techniques.
METHODS
Seven patients with brain abscesses and ten patients with cystic brain tumors were studied from September 2003 to October 2005. Abscess, subdural empyema and ventriculitis were categorized to the abscess group and cystic or necrotic brain gliomas or metastatic brain tumors into the tumor group. Preoperative magnetic resonance images were perfomed in all patients and diffusion-weighted images and apparent diffusion coefficiency values of lesions were calculated directly from software of 1.5 tesla MRI (General Electrics, USA). The ratio of the ADC of the lesion to contralateral regional ADC was also measured (relative ADC, rADC).
RESULTS
The average ADC value of pyogenic abscesses group was 0.82+/-0.14x10-3 (mean+/-S.D.) mm(2)/s and mean rADC was 0.75. Cystic or necrotic areas had high ADC values (2.49+/-0.79x10-3 mm(2)/s, mean rADC=2.14). ADC and rADC values of abscesses group showed about three times lower values than those of cystic or necrotic tumor group.
CONCLUSION
This study results based on numerical comparison of signal intensities and quantitative analysis to distinguish between brain abscess and cystic or necrotic tumor, DWI and ADC mapping are thought to be very useful diagnostic tools.
Key Words: Abscess; Brain tumor; Magnetic resonance imaging; Diffusion-weighted imaging; Apparent-diffusion coefficiency
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