title: Clinically silent choroid plexus cyst: evaluation by diffusion-weighted MRI.
abstract: We retrospectively reviewed diffusion-weighted magnetic resonance images of 57 patients with a choroid plexus cyst diagnosed by contrast-enhanced T1-weighted imaging. All the cysts appeared to represent incidental findings. Thirty-eight of 57 patients had bilateral cysts and 19 had unilateral ones. On diffusion-weighted images, 78 of 95 cysts showed homogeneously high signal intensity, 12 showed focal high signal areas, and 5 had no portion with a high signal. The apparent diffusion coefficient of the high signal areas in the cysts was (1.46+/-0.14) x10(-3) mm(2)/s, intermediate between the apparent diffusion coefficients of cerebrospinal fluid and cerebral white matter, (3.15+/-0.67) x10(-3) and (0.79+/-0.22) x10(-3) mm(2)/s, respectively. Pathological correlation was available in one case, showing high signal intensity areas in the glomera of the choroid plexuses in the lateral ventricles on diffusion-weighted images corresponding to gelatinous cysts with highly proteinaceous content.
authors.affiliation: Division of Radiology, Department of Pathophysiological and Therapeutic Science, Faculty of Medicine, Tottori University, Yonago, Tottori 683-8504, Japan. kino@grape.med.tottori-u.ac.jp
authors.forename: Toshibumi
authors.initials: T
authors.lastname: Kinoshita
authors.forename: Toshio
authors.initials: T
authors.lastname: Moritani
authors.forename: Akio
authors.initials: A
authors.lastname: Hiwatashi
authors.forename: Yuji
authors.initials: Y
authors.lastname: Numaguchi
authors.forename: Henry Z
authors.initials: HZ
authors.lastname: Wang
authors.forename: Per-Lennart A
authors.initials: PL
authors.lastname: Westesson
authors.forename: Shuji
authors.initials: S
authors.lastname: Sugihara
authors.forename: Eiji
authors.initials: E
authors.lastname: Matsusue
authors.forename: Shinya
authors.initials: S
authors.lastname: Fujii
authors.forename: Eisaku
authors.initials: E
authors.lastname: Ohama
authors.forename: Toshihide
authors.initials: T
authors.lastname: Ogawa
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001927:Brain Diseases / Q000473:pathology*; D002831:Choroid Plexus / Q000473:pathology*; D003560:Cysts / Q000473:pathology*; D038524:Diffusion Magnetic Resonance Imaging; D005260:Female; D006801:Humans; D033162:Incidental Findings; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies