The present investigation deals with an analysis of the tomographic findings in an earlier published material of dislocations of the incus. Of 34 patients in whom tomography was performed, agreement between the tomographic and surgical findings was found in 22. In nine patients the tomograms were considered not conclusive. In three the discrepancy is more or less unexplainable. The importance of the optimum technique is stressed, and the technique is described and discussed. In six patients the incus could not be found during operation, but is with certainty present at tomography in at least three. The conclusion is that neither a tomographic finding nor a surgical finding is to be considered as the final truth.