title: [Primary diaphragmatic schwannoma which needed to be distinguished from a liver tumor].
abstract: A 55-year-old woman was admitted because of a tumor located in the ventral region of S4 of the liver, just beneath the diaphragm. A CT scan revealed the round tumor to be delineated as a 33 mm in size, with an outer capsule. The tumor was visualized as concentric circles which presented high-, low-, and high- signal patterns on T2-weighted MRI. It also presented a triphasic pattern in which the border and the central part were not contrasted as a low signal pattern, while the middle part was contrasted as a high signal pattern by T1-weighted enhanced imaging with Gd-DTPA. Angiography revealed that the tumor did not originate from the liver but from the diaphragm, so it was surgically resected as a primary diaphragmatic tumor. We report a schwannoma which originated from the diaphragm, that showed characteristic imaging findings and required to be distinguished from a liver tumor.
authors.affiliation: Digestive Disease Center, Asahikawa City Hospital. r_sukegawa@city.asahikawa.hokkaido.jp
authors.forename: Ryuji
authors.initials: R
authors.lastname: Sukegawa
authors.forename: Akinori
authors.initials: A
authors.lastname: Matsumoto
authors.forename: Satoshi
authors.initials: S
authors.lastname: Suzuki
authors.forename: Motoya
authors.initials: M
authors.lastname: Tominaga
authors.forename: Kazuya
authors.initials: K
authors.lastname: Koizumi
authors.forename: Yoko
authors.initials: Y
authors.lastname: Kikuchi
authors.forename: Kenichiro
authors.initials: K
authors.lastname: Ozawa
authors.forename: Atsushi
authors.initials: A
authors.lastname: Chiba
authors.forename: Masaki
authors.initials: M
authors.lastname: Taruishi
authors.forename: Makoto
authors.initials: M
authors.lastname: Hanawa
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Saitoh
mesh_terms: D003937:Diagnosis, Differential; D003964:Diaphragm; D005260:Female; D006801:Humans; D008113:Liver Neoplasms / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D019042:Muscle Neoplasms / Q000175:diagnosis*; D009442:Neurilemmoma / Q000175:diagnosis*