title: Malignant breast masses detected only by ultrasound: a retrospective review.
authors.forename: D B
authors.initials: DB
authors.lastname: Kopans
authors.forename: S A
authors.initials: SA
authors.lastname: Feig
authors.forename: E A
authors.initials: EA
authors.lastname: Sickles
mesh_terms: D001943:Breast Neoplasms / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D012189:Retrospective Studies; D014463:Ultrasonography