Related Experiment Video
Updated: Sep 28, 2026

Endoscopic Approach for Colloid Cyst Resection
Published on: May 23, 2025
[Epidermoid cyst of the fourth ventricle: four case reports]
H Marin1, M I Vargas, M Grebici-Guessoum
1Services de Radiologie, CHU de Hautepierre, 67098 Strasbourg, France.
Abstract:
Patients with epidermoid cyst of the fourth ventricle usually present with headaches and/or disequilibrium. These cysts are characterized by a focal lesion that is nearly isodense to CSF at CT and nearly isointense to CSF on T1W and T2W MR images. MRI using FLAIR and diffusion weighted images as well as 3D CISS acquisitions is useful to better characterize the lesions and their relation with the vermis, foramen magnum and CP angle cisterns. DWI images are useful for postsurgical evaluation of residual tumor. Extension of the cyst into the CP angle cisterns usually precludes complete surgical resection.
Related Concept Videos
Anatomy of the Brain: Ventricles
Brain Abscess l: Introduction
Cerebral Edema l: Introduction
Cranial Bones: Lateral View
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
