Demonstration of Small Acoustic Neuromas, using Negative Contrast Medium with Tomography

Auditory brain stem response and computed tomography in acoustic tumour investigations

“…Pneumoencephalography has been used since the 1940s in the diagnosis of posterior fossa tumours. In an attempt to reduce the considerable morbidity associated with this study, Siew et al (1968) used much smaller volumes of air (7-14 ml.) and studied the IAM with polytomography.…”