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3D T2-weighted turbo spin-echo MR sequence for identifying cerebrospinal fluid leak after endoscopic endonasal
Sang-Bong Chung1, Kyung-Su Kwag, Sung Tae Kim
1Department of Neurosurgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, 50 Ilwon-dong, Gangnam-gu, Seoul, 135-710, Republic of Korea.
Background:
This study aimed to assess the efficacy of MR images with 3D T2-weighted turbo spin-echo (3D T2-TSE) sequences for early identification of postoperative cerebrospinal fluid (CSF) leaks.
Methods:
We analyzed the medical records and radiological reports for 72 consecutive patients who underwent an endoscopic endonasal approach for sellar and parasellar lesions between April 2009 and December 2010. Patients were 38 men and 34 women with a mean age of 46.4 years. All underwent MR scanning within 2 postoperative days, which included 3D T2-TSE sequences as well as a conventional T2-weighted (T2W) protocol. Sequence accuracy in predicting postoperative CSF leaks was assessed for sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV).
Results:
A postoperative CSF leak was confirmed in 6 of 72 patients (8.3 %). On immediate postoperative MR images, 39 patients were suspicious for CSF leaks on conventional T2W sequences, while 18 patients on 3D T2-TSE. The 3D T2-TSE imaging had superior specificity and PPV (50 % vs. 81.8 %, 15.4 % vs. 33.3 %), while there was no difference in sensitivity and NPV compared with conventional T2W sequences.
Conclusion:
Compared to the conventional T2W protocol, MR imaging with the 3D T2-TSE protocol provides differential images around the sellar area with improved specificity and PPV for the detection of postoperative CSF leaks.
Insights
Three-dimensional T2-weighted turbo spin-echo (3D T2-TSE) MRI sequences improve the early detection of postoperative cerebrospinal fluid (CSF) leaks. This advanced MRI technique offers higher specificity and positive predictive value compared to conventional T2W sequences.
Area of Science:
- Radiology
- Neurosurgery
- Medical Imaging
Background:
- Postoperative cerebrospinal fluid (CSF) leaks are a significant complication after surgery.
- Early and accurate identification of CSF leaks is crucial for patient management.
- Conventional MRI sequences may have limitations in detecting subtle leaks.
Purpose of the Study:
- To evaluate the effectiveness of 3D T2-weighted turbo spin-echo (3D T2-TSE) MRI sequences.
- To compare the diagnostic performance of 3D T2-TSE with conventional T2-weighted (T2W) sequences.
- To assess the early identification of postoperative CSF leaks.
Main Methods:
- Retrospective analysis of 72 patients undergoing endoscopic endonasal surgery.
- Comparison of MR images obtained with 3D T2-TSE and conventional T2W protocols.
- Assessment of sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV).
Main Results:
- Postoperative CSF leaks occurred in 8.3% of patients.
- 3D T2-TSE sequences showed higher specificity (81.8%) and PPV (33.3%) than conventional T2W (50% and 15.4%).
- No significant difference in sensitivity or NPV was observed between the two sequences.
Conclusions:
- 3D T2-TSE MRI provides superior specificity and PPV for detecting postoperative CSF leaks.
- This advanced MRI protocol enhances the visualization of the sellar area for leak identification.
- 3D T2-TSE is a valuable tool for early diagnosis of CSF leaks post-surgery.
