BRAIN - Metastatic Tumour

The specimen consists of two slices of brain. In the lower section a focus of metastatic tumour is seen in the left superior parietal gyrus. There is expansion of the white matter in the left parietal lobe with obliteration of the gyral pattern both laterally and superiorly. Microscopic examination of the tumour showed it to be metastatic poorly differentiated adenocarcinoma that had evoked profound gliosis and oedema in the adjacent white matter. The primary site of the tumour was not discovered at post mortem. The upper slice shows a congenital abnormality of the septum pellucidum known as bulbi septae pellucidi this appears to develop from splitting of the septum pellucidum during organogenesis.