Myositic pseudotumour of the orbit

Area of Science:

• Ophthalmology
• Radiology
• Pathology

Background:

• Orbital myositic pseudotumours and Graves' ophthalmopathy are distinct orbital inflammatory conditions.
• Computed tomography (CT) is crucial for diagnosing orbital diseases, often distinguishing between these two entities based on characteristic imaging findings.

Observation:

• A patient presented with bilateral exophthalmos.
• The initial CT imaging demonstrated features consistent with Graves' ophthalmopathy.

Findings:

• Despite characteristic CT findings of Graves' ophthalmopathy, the patient was ultimately diagnosed with orbital myositic pseudotumour.
• This case highlights a potential overlap in CT imaging features between these two conditions.

Implications:

• The findings suggest that CT features alone may not always be sufficient to differentiate between orbital myositic pseudotumour and Graves' ophthalmopathy.
• Clinical correlation and potentially further investigations may be necessary in ambiguous cases.
• This underscores the importance of considering differential diagnoses even when imaging suggests a specific condition.