Magnetic resonance imaging supplements ultrasonographic imaging of the posterior fossa, pharynx and neck in malformed fetuses

Objective The objective of this study was to compare antepartum ultrasonogr aphy and magnetic resonance imaging (MRI) in the diagnosis and exclusion of malformations of the fetal neck, pharynx, skull base and posterior fossa i n late pregnancy. Materials and methods The study involved 26 women and 27 fetuses with ultra sonographically or clinically suspected abnormalities of the fetal neck, ph arynx or central nervous system (CNS). Findings obtained by ultrasound were compared with those obtained by MRI (1.5 T) in the last trimester. Results In cases with CNS malformation (n = 19), MRI provided additional in formation on the anatomy of the foramen magnum and posterior fossa in nine cases (47%). When antepartum ultrasonography indicated malformation of the soft tissues of the neck or pharynx (n = 8), MRI provided additional inform ation on diagnosis or exclusion of the abnormality in six cases (75%). The imaging capacity of the anatomy of the naso-, oro- and hypopharynx, trachea , esophagus and cervical skin outlines was better with MRI.