1.   The FDA followed that advice when granting final approval to the wafers, which are placed inside the brain cavity that is left after a surgeon removes a tumor.

2.   Ganga and Jamuna Shrestha, who come from a poor family on the outskirts of Katmandu, share the same brain cavity.

3.   Ganga and Jamuna Shrestha are joined at the top of the head and share the same brain cavity.

4.   Siamese twins expert Dr. Benjamin Carson of Johns Hopkins University Hospital said the greatest post-surgery risks the twins faced were infection and fluid in the brain cavity.

5.   The meningococcus bacteria may not have spread into his spinal canal or brain cavity, which would have inflamed their linings and caused his neck to feel stiff.

6.   The Nepalese twins were connected at the tops of their heads and shared the same brain cavity.

7.   The researchers extracted almost pure samples from the lining of brain cavities known as ventricles.