Abstract
A 37-year-old female presented with right eye proptosis, eyelid swelling, and pain lasting for 7 days upon admission. There was no pertinent personal or family medical history or prior incidence of cysticercus infestation. The computed tomography (CT) images revealed an oval soft tissue density mass in the right orbit, containing a low-density shadow within. Magnetic resonance imaging (MRI) revealed an oval-shaped mass, exhibiting hypointense on T1-weighted images (T1WI) and hyperintense on T2-weighted images (T2WI). In addition, a circular signal that was hyperintense on T1WI and hypointense on T2WI was observed within the mass. B-mode ultrasonography showed an oval mass within the hypoechoic lesion, which changed with position. All imaging features mimicked those of cysticercosis. The lesion was excised, and the pathologic examination showed an epidermoid cyst. When encountering a round mass within a fluid lesion that exhibits positional changes, it is essential to consider not only cysticercosis, but also an epidermoid cyst.
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