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Radiologic Features of Well-circumscribed Orbital Tumors With Histopathologic Correlation: A Multi-center Study
Kelsey A Roelofs1, Valerie Juniat2, Michael O'Rouke3
1Division of Orbital and Ophthalmic Plastic Surgery, Jules Stein Eye Institute, University of California, Los Angeles, California, U.S.A.
Ophthalmic Plastic and Reconstructive Surgery
|January 12, 2024
Summary
This study identifies key MRI features to differentiate solitary fibrous tumors, schwannomas, cavernous venous malformations, and orbital lymphoma. T2 intensity, contrast enhancement, and ADC ratio are crucial for accurate diagnosis.
Area of Science:
- Ophthalmology
- Radiology
- Oncology
Background:
- Orbital tumors can present with similar imaging characteristics, posing diagnostic challenges.
- Accurate differentiation of orbital lesions is crucial for appropriate treatment planning and patient outcomes.
Purpose of the Study:
- To delineate specific magnetic resonance imaging (MRI) characteristics of solitary fibrous tumors, schwannomas, cavernous venous malformations, and well-circumscribed orbital lymphoma.
- To identify radiologic features that aid in differentiating these four common orbital tumors.
Main Methods:
- Retrospective review of preoperative MRI scans from 91 patients with histopathologically confirmed solitary fibrous tumor, schwannoma, cavernous venous malformation, or orbital lymphoma.
- Exploratory statistical analysis to identify significant radiologic features, followed by random forest modeling.
- Evaluation of histopathologic correlates for key imaging findings.
Main Results:
- Solitary fibrous tumors were predominantly anterior/mid orbit with T2 heterogeneity. Schwannomas were often intraconal and posterior. Cavernous venous malformations showed characteristic progressive contrast enhancement.
- Orbital lymphoma lesions were hypointense on T2 and exhibited significantly lower apparent diffusion coefficient (ADC) ratios compared to other tumor types.
- While most lesions were T1 hypointense, T2 signal characteristics, contrast enhancement patterns, and ADC ratios varied significantly among the four tumor types.
Conclusions:
- Key differentiating features for these orbital tumors include T2 signal intensity and homogeneity, contrast enhancement patterns, and ADC ratios.
- These MRI-based features can aid radiologists in distinguishing between solitary fibrous tumors, schwannomas, cavernous venous malformations, and orbital lymphoma.
- Improved diagnostic accuracy through advanced imaging analysis can lead to more tailored management strategies for patients with orbital masses.
