title: Prenatal diagnosis of retroperitoneal teratoma: a case report and review of the literature.
abstract: We report a case of retroperitoneal teratoma diagnosed prenatally by serial sonographic examinations in the third trimester. A 29-year-old woman was referred for sonographic evaluation at 33 weeks' gestation because of a fetal intra-abdominal mass. Our initial sonographic image suggested a neuroblastoma. Repeat ultrasound images demonstrated an increase in size of the tumor, while the content of the tumor became predominantly solid with areas of calcification. Teratoma should be considered on detection of any cystic or mixed semisolid mass, especially when calcification is present. The fetus was prenatally diagnosed with retroperitoneal teratoma. After birth at 39 weeks, the tumor was removed and histological analysis revealed an immature retroperitoneal teratoma. Intensive monitoring of the changes in ultrasound images of the tumor should provide ground for a precise antenatal diagnosis.
authors.affiliation: Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan. tettyan@sc.itc.keio.ac.jp
authors.forename: Satoshi
authors.initials: S
authors.lastname: Asai
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Ishimoto
authors.forename: Seon Hye
authors.initials: SH
authors.lastname: Kim
authors.forename: Takayuki
authors.initials: T
authors.lastname: Higuchi
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Minegishi
authors.forename: Mamoru
authors.initials: M
authors.lastname: Tanaka
authors.forename: Ken
authors.initials: K
authors.lastname: Hoshino
authors.forename: Yasuhide
authors.initials: Y
authors.lastname: Morikawa
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Yoshimura
mesh_terms: D000328:Adult; D005260:Female; D005333:Fetus / Q000473:pathology; D006801:Humans; D008279:Magnetic Resonance Imaging; D011247:Pregnancy; D012186:Retroperitoneal Neoplasms / Q000000981:diagnostic imaging* / Q000601:surgery; D013724:Teratoma / Q000000981:diagnostic imaging* / Q000601:surgery; D016216:Ultrasonography, Prenatal