Radiology Miscellaneous 0bea1e21

There is a lesion in the orbit. Can you diagnose?

Choroidal melanoma

Ocular retinoblastoma

Foreign body in the orbit

Optic nerve drusen

High-Yield Explanation

Ans. A. Choroidal melanomaThe hyperintensity on T1 weighted MRI very specific for presence of melanin containing tumor in the orbit.The other causes of T1 hyperintensities are1. Blood products2. Proteinaceous substances3. Fat4. Gadolinium

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There is a lesion in the orbit. Can you diagnose?

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