title: [Usefulness of multiphase helical CT in the diagnosis of pituitary microadenoma].
abstract: The purpose of this study was to determine the value of multiphase helical CT (MHCT) in the diagnosis of pituitary microadenoma. Twenty-two patients with clinically suspected microadenoma were examined. Coronal pre-contrast CT was initially carried out. Three series of helical scanning using 1-mm collimation, 1-mm/s table speed, and 1-mm interval reconstruction covering the entire pituitary gland were performed with an intravenous injection of contrast medium. Immediately after MHCT, delayed CECT was performed. Twenty microadenomas (3-10 mm, mean: 5.5 mm) were surgically confirmed. MHCT could depict all 20 tumors, while pre-contrast CT and delayed CECT showed 4 and 12 of 20 tumors, respectively. MHCT was useful in the diagnosis of pituitary microadenoma owing to its high spatial resolution and extensive coverage.
authors.affiliation: Nippon Medical School, Department of Radiology.
authors.forename: R
authors.initials: R
authors.lastname: Takagi
authors.forename: Y
authors.initials: Y
authors.lastname: Amano
authors.forename: N
authors.initials: N
authors.lastname: Uchiyama
authors.forename: H
authors.initials: H
authors.lastname: Hayashi
authors.forename: A
authors.initials: A
authors.lastname: Teramoto
authors.forename: T
authors.initials: T
authors.lastname: Kumazaki
mesh_terms: D000236:Adenoma / Q000000981:diagnostic imaging*; D006801:Humans; D010911:Pituitary Neoplasms / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed / Q000379:methods*