title: Pineal cystic germinoma with syncytiotrophoblastic giant cells mimicking MR imaging findings of a pineal cyst.
abstract: We report a case of precocious puberty in a 4-year-old boy. Contrast-enhanced T1-weighted MR imaging suggested a pineal cyst with enhancement of the slightly thickened wall and focal wall irregularity. Three-dimensional constructive interference in a steady-state imaging revealed a focal lobulation and a nodule-like area in the lesion. The lesion mimicking a pineal cyst proved to be a germinoma with syncytiotrophoblastic giant cells, on the basis of biopsy and tumor marker results.
authors.affiliation: Department of Radiology, Kumamoto University School of Medicine, Kumamoto, Japan.
authors.forename: Yoshiko
authors.initials: Y
authors.lastname: Hayashida
authors.forename: Toshinori
authors.initials: T
authors.lastname: Hirai
authors.forename: Yukunori
authors.initials: Y
authors.lastname: Korogi
authors.forename: Masato
authors.initials: M
authors.lastname: Kochi
authors.forename: Noriko
authors.initials: N
authors.lastname: Maruyama
authors.forename: Masayuki
authors.initials: M
authors.lastname: Yamura
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Yamashita
mesh_terms: D001706:Biopsy; D002675:Child, Preschool; D003560:Cysts / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D003937:Diagnosis, Differential; D015726:Giant Cells / Q000473:pathology*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D008279:Magnetic Resonance Imaging; D008297:Male; D010870:Pineal Gland / Q000473:pathology; D010871:Pinealoma / Q000175:diagnosis* / Q000473:pathology; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed; D014327:Trophoblasts / Q000473:pathology*