title: Early First-Trimester Appearance of a Hydatidiform Mole on Sonography: The "Snowball" Sign.
authors.affiliation: Department of Radiology, University of Southern California Keck School of Medicine, Los Angeles, California USA.
authors.forename: Stephen
authors.initials: S
authors.lastname: Chan
authors.affiliation: Department of Radiology, University of Southern California Keck School of Medicine, Los Angeles, California USA.
authors.forename: Edward G
authors.initials: EG
authors.lastname: Grant
authors.affiliation: Department of Radiology, University of Southern California Keck School of Medicine, Los Angeles, California USA.
authors.forename: Frank K
authors.initials: FK
authors.lastname: Chen
authors.affiliation: Department of Pediatrics Olive View-UCLA Medical Center Sylmar, California USA.
authors.forename: Yasangi M
authors.initials: YM
authors.lastname: Jayasinha
authors.affiliation: Department of Radiology, University of Southern California Keck School of Medicine, Los Angeles, California USA.
authors.forename: Mittul
authors.initials: M
authors.lastname: Gulati
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D006828:Hydatidiform Mole / Q000000981:diagnostic imaging*; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D014463:Ultrasonography / Q000379:methods*; D014594:Uterine Neoplasms / Q000000981:diagnostic imaging*; D014599:Uterus / Q000000981:diagnostic imaging