Susceptibility-weighted imaging in carotido-cavernous fistulas. A case control study
Kamble Jayaprakash Harsha1, Ram Shenoy Basti, Chandrasekharan Kesavadas
1Department of Imaging Sciences and Interventional Radiology, Sree Chitra Tirunal Institute for Medical Sciences and Technology; Thiruvananthapuram, India - drbejoy2002@yahoo.com.
Summary
Susceptibility-weighted MRI (SWI) accurately detects carotid cavernous fistulas (CCF) by analyzing the SOV/SSS signal intensity ratio. This method effectively differentiates between direct and indirect CCF types, proving useful in clinical diagnosis.
Area of Science:
- Radiology
- Neuroimaging
- Vascular Imaging
Background:
- Carotid cavernous fistulas (CCF) are abnormal connections between the carotid artery and cavernous sinus.
- Accurate detection and differentiation of CCF types are crucial for effective treatment planning.
- Conventional imaging methods may have limitations in visualizing subtle CCF characteristics.
Purpose of the Study:
- To evaluate the diagnostic utility and accuracy of susceptibility-weighted MRI (SWI) for detecting carotid cavernous fistulas (CCF).
- To assess SWI's ability to differentiate between direct and indirect CCF subtypes.
- To determine the reliability of the superior ophthalmic vein (SOV) to superior sagittal sinus (SSS) signal intensity ratio in SWI for CCF diagnosis.
Main Methods:
- Retrospective comparison of SWI images in 9 patients with DSA-proved CCF (Group 1) and 19 DSA-negative controls (Group 2).
- Measurement of signal intensity within the SOV and SSS on SWI magnitude images.
- Calculation and comparison of the SOV/SSS signal intensity ratio between groups and CCF subtypes.
Main Results:
- A statistically significant difference in SOV/SSS ratios was observed between CCF patients and controls (P<0.0001).
- An SOV/SSS ratio of 0.64 served as a reliable cut-off for distinguishing CCF cases from controls.
- Direct CCF cases exhibited higher SOV/SSS ratios compared to indirect CCF cases.
Conclusions:
- SWI is a highly sensitive and accurate imaging modality for the detection of carotid cavernous fistulas.
- SWI effectively differentiates between direct and indirect CCF, aiding in diagnosis and management.
- The SOV/SSS signal intensity ratio on SWI is a valuable quantitative marker for CCF diagnosis.
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