Table 2.

Pros and cons for each corridor for the management of olfactory groove meningiomas (OGM).

Corridor	Pros	Cons
Anterior Route
Bilateral subfrontal approach	short surgical corridor wide exposure management of the hyperostotic anterior skull base bone optic canals unroofing	overexposure and significant retraction of the frontal lobes late exposure and risk of injury of optic apparatus, ICA, ACA, and ACoA risk of CSF leak and meningitis due to the opening of frontal sinus superior sagittal sinus ligation bilateral frontal lobe retraction
Unilateral subfrontal approach	No superior sagittal sinus ligation No bilateral frontal lobe retraction No frontal sinus opening short surgical corridor wide exposure management of the hyperostotic anterior skull base bone optic canals unroofing	late exposure and risk of injury of critical optic apparatus, ICA, ACA, and ACoA
Transbasal approach	early devascularization of the tumor (early coagulation of the anterior ethmoidal arteries) excellent access to paranasal sinuses and the orbits	late exposure and risk of injury of critical optic apparatus, ICA, ACA, and ACoA prolonged surgical times risks of long-term cosmetic defects High CSF leak rate
Anterolateral Route
Pterional approach and its variants	lower rates of postoperative CSF leak preservation of the frontal sinus early CSF release early identification and protection of the neurovascular structures preservation of the olfaction	difficult access to the contralateral side in cases of large/giant tumors
Ventral Route
Endonasal transethmoidal transcribiform approach	Early tumor devascularization Direct access to paranasal sinuses and/or the orbits direct decompression of optic nerves straight control of the perforating vessels	high risk of postoperative CSF leak Anosmia

CSF: cerebrospinal fluid; ICA: internal carotid artery; ACA: anterior cerebral artery; ACoA: anterior communicating artery.