Computed Tomography: Evaluation of the Posterior Third Ventricle

Abstract

The normal computed tomography (CT) appearances of the posterior 3rd ventricular and related structures are presented. Patients (76) with lesions directly involving this ventricle were studied by CT, and results of other neurological procedures evaluated. Primary tumors, metastases, hematomas, infarcts and cysts may be reliably distinguished by CT, particularly if contrast enhancement was utilized. Size and density resolution limited the direct visualization of the aqueduct of Sylvius; stenosis, however, may be inferred. Small infarcts may be difficult to demonstrate by the use of CT scans without contrast enhancement, yet they may be shown by isotope scans.