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Newer Diagnostic Methods

William N. Hanafee, MD; Gabriel H. Wilson, MD

Arch Otolaryngol. 1970;92(3):236-243.

Abstract
Four newer aids for diagnosis of pontocerebellar angle tumor used in 37 patients with tumors presenting as pontocerebellar angle lesions were: (1) tomography of the internal auditory canal in the basal projection; (2) tomography of the internal auditory canal during iophendylate injection (Pantopaque) posterior fossa study, utilizing an x-ray beam that is horizontally directed somewhat parallel to the floor; (3) tomography during pneumoencephalography with the patient in the erect position; and (4) selective catheter vertebral angiography aided by subtraction technique. Tomography of the iophendylate injection-filled internal auditory canal will exclude intracanalicular acoustic neuromas; nonfilling does not establish presence of tumors. Lobulations of intraaxial tumors growing into the pontocerebellar angles usually can be differentiated from acoustic neuromas by tomography during pneumoencephalography. Vertebral angiography permits examinations of patients with increased intracranial pressure and identifies early tumors by venous displacement, tumor staining, or, less frequently, arterial displacements.

Author Affiliations
Los Angeles

From the Department of Radiology, UCLA Center for the Health Sciences.

Footnotes
Accepted for publication April 24, 1970.

Reprint requests to Department of Radiology, UCLA Center for the Health Sciences, Los Angeles 90024 (Dr. Hanafee).

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