an anatomical and radiological study of the high jugular bulb on highresolution ct scans and alcoholfixed skulls of adults although many reports mention a high jugular bulb hjb it is often not clearly defined we examined the relationship between the jugular bulb jb and the internal auditory canal iac in 200 temporal bones on high resolution ct scans and alcoholfixed skull bases of adults the average distance standard deviation between the iac and the jb was 7523mm range 116 mm the jb was higher on the right side than its companion in 533 of patients left side only in 22 no side dominance in 237 of bases when the jb reached or exceeded the floor of the iac 165 it was defined as a hjb 61 of hjb were found in females bilateral hjb was found in 05 of patients the hjb was not associated with a contralateral flat jb preoperative multiplanar high resolution ct reconstructions make the most detailed assessment of structural topography