Which imaging modality can diagnose Orbital Pseudotumor?

Which imaging modality can diagnose Orbital Pseudotumor?

• A. CT
• B. MRI
• C. CT/MRI
• D. Ultrasound

Answer: (C)

Orbital pseudotumor presents as an inflammatory process in the orbit, and imaging is essential to confirm the diagnosis and assess the extent. Both CT and MRI can reveal the inflammatory pattern, typically showing enlargement and inflammation of orbital structures such as the extraocular muscles, lacrimal gland, or orbital fat with post-contrast enhancement. CT offers excellent bone detail and can show muscle enlargement and tendon involvement, while MRI provides superior soft-tissue contrast and helps evaluate optic nerve involvement and differentiate inflammatory disease from neoplasm. Because either modality can demonstrate the characteristic inflammation and aid in distinguishing it from other conditions, the combination of CT or MRI is the most capable approach. Ultrasound has limited sensitivity for deep orbital structures and is not the primary diagnostic tool for this condition.