PMC5118380_01
Preoperative computed tomography and magnetic resonance imaging: a axial non-contrast computed tomography (CT) scan showing a slight hyperdense lesion lying in the prepontine cistern; b, c axial T1- and T2-weighted magnetic resonance imaging (MRI) demonstrated a hyperintense mass in the prepontine cistern, the basal artery was enveloped and the brainstem was compressed; d axial FLAIR image shows a hyperintense extra-axial cyst compared with CSF; e, f sagittal and coronal enhanced MRI scans demonstrate a heterogeneously non-enhanced ovoid mass located ventral to pons and medulla
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Fig1
Computer tomography (CT) of brain revealed a hyper-dense lesion in the prepontine cistern (Fig. 1a), and magnetic resonance imaging (MRI) showed an oval cystic lesion located between clivus and brainstem, measuring 4.6 cm x 1.6 cm. T1-weighted and T2-weighted images (Fig. 1b, c). The fluid-attenuated inversion recovery (FLAIR) sequences showed cyst hyperintensity to CSF (Fig. 1d). Gadolinium administration caused no enhancement of the cyst wall and contents (Fig. 1e, f).