A preliminary report is presented on a new technique for the detection and the diagnosis of intracanalicular acoustic neuromas. The technique consists of preliminary CT scans on petrous bones, after iv administration of a bolus of contrast medium. The scans are performed at a predetermined level of the middle portion of the internal auditory canals. The early enhancement is then evaluated of the soft tissues contained into the auditory canal on the side with retrocochlear neurosensory hypoacusis. The images obtained are then processed by an image processing program, thus enhancing the contrast resolution and allowing an optimal depiction of the lesion. In the past 10 months, 67 patients with clinical suspicion of acoustic neuromas were studied. This technique allowed the diagnosis of 2 acoustic neuromas with a purely intracanalicular involvement.