There is a lesion in the orbit. Can you diagnose?
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
Choroidal melanoma
Ocular retinoblastoma
Foreign body in the orbit
Optic nerve drusen
Miscellaneous