One large ross drawing of the operation with two smaller detailed drawings below of the suctioning of the tumour and an outline diagram of the patient's head to show the position of the incision. Annotations on the back read "Jefferson patient's name 16.11.37" and "brain more exciting. Pineal. Add suction nozzle into empty tumour. See that bone incision goes to middle behind as well as above".
Signed by the artist, bottom right corner.