Table 3.
Location | Craniotomy | Surgical approach | Safe entry zone |
---|---|---|---|
Central/ventral | Fronto-orbito zygomatic/pterional | Transsylvian | Corridor lateral to the emergence of CN III between the SCA and the PCA, and medial to the pyramidal tract |
Ventrolateral | Fronto-orbito zygomatic/temporal | Transsylvian | The lateral mesencephalic sulcus, covered by the lateral mesencephalic vein |
Subtemporal transtentorial | |||
Posterolateral | Suboccipital | Lateral supracerebellar infratentorial | The lateral mesencephalic sulcus, covered by the lateral mesencephalic vein |
Paramedian | Extreme-lateral supracerebellar infratentorial | ||
Retrosigmoid | |||
Dorsal - midline | Midline | Median supracerebellar infratentorial | Two narrow horizontal lines immediately above and below the lamina quadrigemina |
Suboccipital | Occipital transtentorial approach | ||
Occipital |
CN – Cranial nerve; SCA – Superior cerebellar artery; PCA – Posterior cerebral artery