Presentation
Left side orbital pain and left side proptosis with left eye upward gaze limitation.
Patient Data
Ill-defined soft tissue density in left orbital cavity inferior extraconal encased and extended within the inferior rectus muscle with swelling of the muscle and left side proptosis are seen. . The right eye temporal deviation and mild swelling of the left medial rectus muscle are also seen. Thick mucosa and fluid in paranasal sinuses are also seen.
Case Discussion
The case illustrates non-contrast MDCT features of pathology-proved nonspecific orbital inflammation or idiopathic orbital inflammation or in other words inflammatory pseudotumor of the orbit. The main differential diagnosis are orbital granulomatosis with polyangitis, IgG4-related disease, and thyroid orbitopathy.
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