462 THE PINEAL ORGAN 



Post- Mortem Examination. — At autopsy there was bilateral pulmonary 

 collapse and enlargement of the heart. A very large tumour was found in the 

 pineal region (Fig. 311). The photograph reveals the right half of the brain, 

 showing a tumour 2-J- in. in diameter occupying almost the whole of the third 

 ventricle, and extending forwards to the anterior commissure and below to the 

 tuber cinereum. The tumour is infiltrating the superior corpora quadrigemina 



Fig. 312. — Case 7. Low-power Picture of Histological Section of the 



Pineal Tumour. 





Fig. 313. — Case 7. High-power Picture of Histological Section of the 



Pineal Tumour. 



and the midbrain, extending to the interpeduncular space and the upper border 

 of the pons. The point of origin of the tumour is not obvious, but from the 

 mode of extension forwards into the third ventricle, and the direction of infiltra- 



