Choroid plexus papillomas are rare intracranial neoplasms that are most commonly found in the trigone of the lateral ventricles or in the fourth ventricle. Rare cases of extraventricular choroid plexus papillomas have been reported within the cerebellopontine (CP) angle cistern [1-6]. Such cases have been described as either extending from the fourth ventricle via the foramen of Luschka or aris...

BACKGROUND Primary diffuse leptomeningeal gliomatosis (PDLG) is a lethal neoplasm that is characterized by glioma cells exclusively infiltrating into cerebral and spinal meninges. Intraventricular hemorrhage as an initial symptom in PDLG patient has not been reported in the literatures. CASE PRESENTATION A 39-year-old man initially presented with intraventricular hemorrhage. The patient had a...

OBJECTIVE Surgical approaches to ambient cistern lesions are complex. We investigated the microanatomy of the transtemporal-transchoroidal fissure approach to the ambient cistern with emphasis on exposure of the posterior cerebral artery. METHODS Dissections were performed bilaterally in five silicone-injected cadaveric heads. Critical anatomic distances, specifically with reference to the P2...

We report a case of an epidermoid tumor of the right cerebellopontine angle (CPA) in which the contralateral CPA cistern showed abnormal, low signal intensity on T2-weighted fast spin-echo MR images. Diffusion-weighted images showed the epidermoid tumor of the right CPA extending to the prepontine cistern. The cause of the abnormal signal intensity was proved to be an artifactual signal loss du...

deficits. There was no history of head injury or surgery. Plain radiographs of skull showed irregular calcifications in the left temporal region (Figure 1). Computed tomography (CT) of brain revealed a heterogeneous extra axial lesion in the anterior aspect of left temporal fossa and left middle cerebral artery cistern, showing calcification, soft tissue and fat density. Multiple tiny fat dropl...

We report a pathologically proved craniopharyngioma in the prepontine cistern. A 50-year-old woman presented with swallowing difficulty for 1 month. She underwent brain MR and CT imaging. T1-weighted, T2-weighted, and contrast-enhanced T1-weighted images showed a large peripheral enhancing cystic mass in the prepontine cistern. Inside the lesion, high signal intensity (SI) on T1 and low SI on T...