Epidermoid tumor in the fourth ventricle
Makaleler > Tam Makale · 2015
Yazarlar: Pelin Çekiç, Ali Evlice, R. Sener
Journal of Pediatric Neurology, Uluslararası, Scopus, 2015, cilt 03, ss 195-196
Özet
The present patient is a 19-year-old girl who presented with headaches, and vertigo. On a magnetic resonance imaging (MRI) examination, a suspicious, small mass-like lesion was evident on T1-and T2weighted images. No hydrocephalus was noted. There was no contrast enhancement. FLAIR (fluid attenuated inversion recovery), and gradient-echo constructive interference of steady state (CISS), and echo-planar diffusion MRI were added to the imaging protocol. The mass had a muddy appearance (intermixed high and low signal) on FLAIR images, and its overall signal was higher than that of cerebrospinal fluid (CSF). It also had a muddy appearance on gradient-echo CISS images, and its overall signal was lower than that of CSF (Fig. 1a). A tendency of extension of the tumor to a slightly dilated right foramen of Luschka was evident. Echo-planar diffusion imaging sequence revealed high signal in the tumor on b = 1000 s/mm images (Fig. 1b). The apparent diffusion coefficient (ADC) value in the epidermoid tumor was 0.51 × 10−3 mm/s, lower than that of cerebellar parenchyma (0.80 × 10−3 mm/s), and CSF (2.90 and 3.55 × 10−3 mm/s). The lesion was totally excised and the histopathological diagnosis favored epidermoid tumor. Epidermoid tumor represents 0.2% to 1% of all primary intracranial tumors, and they usually occur in the subarachnoid cisterns. Rarely, they can be found