title: MRI of testicular epidermoid cyst.
abstract: This report presents and discusses the magnetic resonance imaging (MRI) and pathological findings of a case of testicular epidermoid cyst. A 35-year old man consulted a physician after he felt an enlargement of the right testis. Physical examination revealed a painless, non-tender, elastic hard mass in the right testis. A radiological examination was performed. MRI demonstrated an enlarged right testis, with a mass in it. The mass showed slightly low signal intensity on T1-weighted imaging, and high signal intensity on T2-weighted imaging. Both the T1- and T2-weighted images revealed a peripheral low signal intensity rim. The mass showed no enhancement. A right orchiectomy was carried out for epidermoid cyst. Pathologic examination showed a well-encapsulated nodule within the right testicular parenchyma, filled with a cheesy, yellow-white material similar in appearance to atheroma. The bull's-eye appearance is considered to depend on the presence of calcification. From the viewpoint of pathology, testicular epidermoid cysts do not always show bull's-eye. We then must recognize that some testicular tumors may be epidermoid cysts even without the bull's-eye findings.
authors.affiliation: Department of Physical Therapy, Tsukuba College of Technology, 4-12-7 Kasuga, Tsukuba-city, Ibaraki 305-0821, Japan.
authors.forename: Tsuguo
authors.initials: T
authors.lastname: Yoshida
mesh_terms: D000328:Adult; D004814:Epidermal Cyst / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D013733:Testicular Diseases / Q000473:pathology*; D013737:Testis / Q000473:pathology