Ross drawing of the pituitary region on the sagittal plane showing an adenoma. Annotations on the back read "Fig.3. Case.1 Hypothalamic extension of adneoma filled with blood" and "Pituitary, Jefferson, 16/1/40".
The drawing features as figure 3 in the publication G. Jefferson, 'Extrasellar extensions of pituitary adenomas. President's address', Proceedings of the Royal Society of Medicine, 1940, vol.33, pp.433-58, in which the following description is given: "Chromophobe pituitary adenoma. Amenorrhoea. Hypothalamic extension of adenoma filled with blood".
Initialled by the artist at the bottom left of the drawing.