title: Multiple penile schwannomas and their magnetic resonance imaging characteristics.
abstract: Penile schwannoma is a rare encapsulated nerve sheath tumor of the  peripheral nerve in the penis. Here, we report a case of multiple, painful,  beadlike, nodular tumors in the penis of a 40-year-old man. The nodules showed  well-defined margins and hypoechoic areas on gray-scale ultrasonograms. They  showed high signal intensity on fat-saturated T2-weighted magnetic resonance  imaging (MRI) and intense enhancement on gadolinium-enhanced T1-weighted MRI,  compatible with their myxoid content. The nodules pressed against the tunica  albuginea and some caused inward indentation, which we considered as indirect  evidence of the tumor location. In conclusion, the MRI characteristics and  location of the nodules together enable presurgical diagnosis of penile  schwannomas, which is especially useful in asymptomatic patients and those  unwilling to undergo surgery.
authors.affiliation: Department of Radiology, Tri-Service General Hospital, 325, Cheng-Kung Rd, Sec. 2, Taipei, 114, Taiwan, Republic of China.
authors.forename: Chiao-Hua
authors.initials: CH
authors.lastname: Lee
authors.forename: Ching-Jiunn
authors.initials: CJ
authors.lastname: Wu
authors.forename: Yen-Lin
authors.initials: YL
authors.lastname: Chen
authors.forename: Guo-Shu
authors.initials: GS
authors.lastname: Huang
authors.forename: Shou-Hung
authors.initials: SH
authors.lastname: Tang
mesh_terms: D000328:Adult; D003287:Contrast Media; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009378:Neoplasms, Multiple Primary; D009442:Neurilemmoma / Q000000981:diagnostic imaging / Q000473:pathology*; D010412:Penile Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D011237:Predictive Value of Tests; D014463:Ultrasonography
chemical_list: D003287:Contrast Media