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Published on: June 14, 2018
MRI of idiopathic orbital inflammatory syndrome using fat saturation and Gd-DTPA
J A Hardman1, S F Halpin, S Mars
1Department of Radiology, University Hospital of Wales, Health Park, Cardiff, UK.
Abstract:
Idiopathic orbital inflammatory syndrome encompasses a group of inflammatory conditions for which no systemic or local cause can be found, and is commonly referred to as orbital pseudotumour. On conventional MRI sequences subtle areas of inflammation or enhancing tissue can easily be masked by the high signal intensity of orbital fat and involvement of the fat itself may not be appreciated. We describe the MRI features of three patients with idiopathic orbital inflammation using frequency-selective fat saturation and Gd-DTPA.
Insights
Idiopathic orbital inflammatory syndrome, or orbital pseudotumor, can be difficult to diagnose with standard MRI. Frequency-selective fat saturation with Gd-DTPA improves visualization of orbital inflammation.
Area of Science:
- Ophthalmology
- Radiology
- Medical Imaging
Background:
- Idiopathic orbital inflammatory syndrome (IOIS) is a diagnosis of exclusion, characterized by inflammation without a discernible cause.
- Orbital pseudotumor is a common term for IOIS, presenting diagnostic challenges in imaging.
- Conventional MRI sequences may obscure inflammatory changes due to orbital fat signal intensity.
Observation:
- This study evaluated three patients diagnosed with IOIS.
- Magnetic resonance imaging (MRI) was utilized to assess the orbital inflammation.
- Frequency-selective fat saturation in conjunction with Gd-DTPA contrast was employed.
Findings:
- Standard MRI sequences can mask subtle inflammatory signs in the orbit.
- The use of frequency-selective fat saturation with Gd-DTPA enhances the detection of inflammatory tissue.
- This technique improves the appreciation of orbital fat involvement in IOIS.
Implications:
- Frequency-selective fat saturation with Gd-DTPA offers improved diagnostic accuracy for IOIS.
- Enhanced MRI visualization aids in the early detection and management of orbital inflammation.
- This technique may refine the understanding and characterization of orbital pseudotumor.
