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Computed tomography and magnetic resonance imaging gave conflicting results in two cases of orbital tumor


, : Computed tomography and magnetic resonance imaging gave conflicting results in two cases of orbital tumor. Japanese Journal of Clinical Ophthalmology 46(10): 1485-1488

We examined two cases of small orbital tumor located in the apex. Optic nerve disturbances including Marcus Gunn pupil and central scotoma were present in both cases. Computed tomography, CT, failed to delineate well-defined tumor mass, leading us to the diagnosis of orbital pseudotumor. Well-delineated tumor was shown later by magnetic resonance imaging, MRI, leading to the final diagnosis of optic nerve sheath meningioma. CT failed to clearly outline the tumor because of beam hardening artifact. MRI seemed to give more reliable data than CT in cases of small tumors located in the orbital apex.

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