title: Magnetic resonance image findings of placental lake: report of two cases.
abstract: Two cases with a large cystic mass within the placenta are reported. By ultrasonography, it was found that both women had a subchorionic hypoechoic lesion (11.0 x 4.8 x 4.0 cm and 6.6 x 3.7 x 2.2 cm, respectively) at 24 and 35 weeks of gestation, respectively. In both cases, turbulent blood flow generated by a pulsatile jet flow (pulse rate; 40 to 60 beats per minute) into the cystic lesion seen on real-time imaging and lesions being low intensity on T1-weighted and isointensity on T2-weighted magnetic resonance image suggested that they contained fresh maternal blood. In both cases, the sonolucency of the lesions did not change until cesarean deliveries of females, both of whom were small-for-gestational-age infants (1940 g at 37 weeks and 2195 g at 37 weeks, respectively). Biochemical analysis of the fluid in the cystic lesion sampled during the cesarean section in the latter case confirmed that the fluid had originated from the maternal blood. These lesions histologically corresponded to large avillous areas surrounded by normal villi. Thus, a huge placental lake was diagnosed in both cases.
authors.affiliation: Department of Obstetrics and Gynecology, Hokkaido University Graduate School of Medicine, Sapporo, Japan. mmamoru@med.hokudai.ac.jp
authors.forename: Mamoru
authors.initials: M
authors.lastname: Morikawa
authors.forename: Kazutoshi
authors.initials: K
authors.lastname: Cho
authors.forename: Soromon
authors.initials: S
authors.lastname: Kataoka
authors.forename: Emi H
authors.initials: EH
authors.lastname: Kato
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamada
authors.forename: Hideto
authors.initials: H
authors.lastname: Yamada
authors.forename: Hisanori
authors.initials: H
authors.lastname: Minakami
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D010922:Placenta Diseases / Q000175:diagnosis*; D011247:Pregnancy; D018615:Ultrasonography, Doppler, Color; D016216:Ultrasonography, Prenatal