FIG 9. Arachnoid cysts associated with hypothalamic hamartomas.

A, T1-weighted coronal view MR image shows a large suprasellar and temporal fossa arachnoid cyst, hypoplasia and compression of the right temporal lobe (bloom artifact due to previous cyst-peritoneal shunt insertion), and cavum septum pellucidum (arrow).

B, T1-weighted coronal view MR image shows a suprasellar arachnoid cyst extending within the hamartoma.

C, T2-weighted axial view MR image shows an anterior temporal arachnoid cyst (arrowhead) remote from the hamartoma (not shown).