Outline drawings of a lateral view of the skull showing filling defect during ventriculography arising from ependymoma. Annotations on the back read "patient's surname 23.3.39 tilted".
This image features as part C of figure 10 in the publication E.W. Twining, 'Radiology of the third and fourth ventricles, part II', British Journal of Radiology, 1939, in which it is described as follows: "Author's drawings of ependymoma arising from left wall posteriory-filling defect somewhat similar to pinealoma".