title: Epidermoid cyst of the testis: An atypical sonographic appearance.
abstract: Epidermoid cysts are rare. They represent the most common benign tumor of the testis. The sonographic appearances of testicular epidermoid cysts usually include avascular, mostly lamellated, heterogeneous internal echotexture, with hypoechoic and hyperechoic concentric rings, accounting for the typical onion-ring appearance. On MRI, epidermoid cysts show a low-signal-intensity center, with internal concentric rings of alternating high- and low-signal intensity on T2-weighted images, which correlates with the onion-ring appearance. We report a patient with testicular epidermoid cyst with atypical ultrasound and MRI appearances that led to the erroneous initial diagnosis of "burned-out" tumor. © 2016 Wiley Periodicals, Inc. J Clin Ultrasound 44:448-451, 2016.
authors.affiliation: Department of Radiology, Taipei Veterans General Hospital, 201, Section 2, Shih-Pai Road, Taipei, Taiwan, Republic of China.|School of Medicine, National Yang-Ming University, Taipei, Taiwan, Republic of China.
authors.forename: Shu-Ting
authors.initials: ST
authors.lastname: Chen
authors.affiliation: Department of Radiology, Taipei Veterans General Hospital, 201, Section 2, Shih-Pai Road, Taipei, Taiwan, Republic of China.|School of Medicine, National Yang-Ming University, Taipei, Taiwan, Republic of China.
authors.forename: Hong-Jen
authors.initials: HJ
authors.lastname: Chiou
authors.affiliation: School of Medicine, National Yang-Ming University, Taipei, Taiwan, Republic of China.|Department of Pathology, Taipei Veterans General Hospital, 201, Section 2, Shih-Pai Road, Taipei, Taiwan, Republic of China.
authors.forename: Chin-Chen
authors.initials: CC
authors.lastname: Pan
authors.affiliation: Department of Radiology, Taipei Veterans General Hospital, 201, Section 2, Shih-Pai Road, Taipei, Taiwan, Republic of China.|School of Medicine, National Yang-Ming University, Taipei, Taiwan, Republic of China.
authors.forename: Shu-Huei
authors.initials: SH
authors.lastname: Shen
authors.affiliation: Department of Radiology, Taipei Veterans General Hospital, 201, Section 2, Shih-Pai Road, Taipei, Taiwan, Republic of China.|School of Medicine, National Yang-Ming University, Taipei, Taiwan, Republic of China.
authors.forename: Yi-Hong
authors.initials: YH
authors.lastname: Chou
authors.affiliation: Department of Radiology, Taipei Veterans General Hospital, 201, Section 2, Shih-Pai Road, Taipei, Taiwan, Republic of China.|School of Medicine, National Yang-Ming University, Taipei, Taiwan, Republic of China.
authors.forename: Chui-Mei
authors.initials: CM
authors.lastname: Tiu
authors.affiliation: Department of Radiology, Taipei Veterans General Hospital, 201, Section 2, Shih-Pai Road, Taipei, Taiwan, Republic of China.|School of Medicine, National Yang-Ming University, Taipei, Taiwan, Republic of China.
authors.forename: Hsin-Kai
authors.initials: HK
authors.lastname: Wang
authors.affiliation: Department of Radiology, Taipei Veterans General Hospital, 201, Section 2, Shih-Pai Road, Taipei, Taiwan, Republic of China.|School of Medicine, National Yang-Ming University, Taipei, Taiwan, Republic of China.
authors.forename: Yi-Chen
authors.initials: YC
authors.lastname: Lai
authors.affiliation: Department of Radiology, Taipei Veterans General Hospital, 201, Section 2, Shih-Pai Road, Taipei, Taiwan, Republic of China.|School of Medicine, National Yang-Ming University, Taipei, Taiwan, Republic of China.
authors.forename: Yung-Hui
authors.initials: YH
authors.lastname: Lin
authors.affiliation: Department of Radiology, Taipei Veterans General Hospital, 201, Section 2, Shih-Pai Road, Taipei, Taiwan, Republic of China.|Department of Radiology, National Taiwan University College of Medicine, Taipei, Taiwan, Republic of China.
authors.forename: Jane
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Radiology, Taipei Veterans General Hospital, 201, Section 2, Shih-Pai Road, Taipei, Taiwan, Republic of China.|School of Medicine, National Yang-Ming University, Taipei, Taiwan, Republic of China.
authors.forename: Cheng-Yen
authors.initials: CY
authors.lastname: Chang
mesh_terms: D003937:Diagnosis, Differential; D004814:Epidermal Cyst / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D013733:Testicular Diseases / Q000000981:diagnostic imaging*; D013737:Testis / Q000000981:diagnostic imaging*; D014463:Ultrasonography / Q000379:methods*
keywords: MRI; burned-out tumor; epidermoid cyst; testis; ultrasound