title: Uterine junctional zone: correlation between histologic findings and MR imaging.
abstract: Uterine zonal anatomy as visualized on T2-weighted (repetition time, 2,500 msec; echo time, 80 msec) magnetic resonance (MR) images consists of a high-intensity central (endometrial) zone, a subjacent low-intensity junctional zone of myometrium, a moderately intense zone of myometrium, and a thin, low-intensity subserosal zone of myometrium. To better define the histologic correlates of these diagnostically significant zones, T2-weighted MR images of 17 in vivo and 13 extirpated human uteri were compared with histologic sections of 17 uteri stained with hematoxylin-eosin, Mallory trichrome, and immunofluorescence staining for actin. Morphometric and electron microscopic observations of uterine surgical specimens were also made. The observations indicate that both the junctional zone and the subserosal zone consist of compact smooth muscle fibers with little extracellular matrix compared with the myometrium proper. Also, the junctional zone is divided into a compact region and a transitional region. The compact region correlates well with the hypointense MR appearance of the junctional zone.
authors.affiliation: Department of Anatomy, College of Medicine, University of South Florida, Tampa 33612-4799.
authors.forename: H K
authors.initials: HK
authors.lastname: Brown
authors.forename: B S
authors.initials: BS
authors.lastname: Stoll
authors.forename: S V
authors.initials: SV
authors.lastname: Nicosia
authors.forename: J V
authors.initials: JV
authors.lastname: Fiorica
authors.forename: P S
authors.initials: PS
authors.lastname: Hambley
authors.forename: L P
authors.initials: LP
authors.lastname: Clarke
authors.forename: M L
authors.initials: ML
authors.lastname: Silbiger
mesh_terms: D000328:Adult; D000368:Aged; D003276:Contraceptives, Oral / Q000008:administration & dosage; D004717:Endometrium / Q000033:anatomy & histology; D005260:Female; D006801:Humans; D007044:Hysterectomy; D008279:Magnetic Resonance Imaging; D008597:Menstrual Cycle; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D009130:Muscle, Smooth / Q000033:anatomy & histology; D009215:Myometrium / Q000033:anatomy & histology / Q000648:ultrastructure; D013194:Staining and Labeling; D014599:Uterus / Q000033:anatomy & histology* / Q000473:pathology / Q000648:ultrastructure
chemical_list: D003276:Contraceptives, Oral