SUPRAORBITAL KEYHOLE CRANIOTOMY IN SURGERY OF INTRA- AND EXTRA-AXIAL BRAIN TUMORS

Background. Priority objectives of surgical neurooncology (diagnosis verification, tumor cytoreduction, and preservation of patient’s functional status) can be achieved both through traditional neurosurgical approaches and through the use of keyhole surgery. Keyhole surgery allows to minimize unnecessary, extended resection of the skull base and long-term static brain tissue retraction.

Objective. The authors present preliminary results of the use of supraorbital keyhole craniotomy in intra- and extra-axial brain tumors. 

Materials and methods. In 2014–2016, 45 patients were operated through supraorbital craniotomy to treat intra- and extra-axial tumors. The majority of patients (n = 28) was diagnosed with anterior cranial fossa meningiomas. Gliomas of the frontal lobe were diagnosed in 12 patients. The average tumor size ranged from 3 to 3.5 cm.

Results. Mortality, disability, or serious permanent access-related complications were not observed in our group. In all cases, the transition to the classical craniotomy was not required. Periorbital edema and transient hypoesthesia were observed in all patients. Permanent frontal hypoesthesia was observed in 3 patients (4 %) for a time period up to six months. According to postoperative MRI performed in all patients at the time of discharge, in the group of intra-axial brain tumor gross-total removal was observed in 8 patients (47 %), in 9 patients (53 %) the tumor was near-totally removed (more than 90 % of the tumor), in the group of meningiomas all 28 patients had gross-total removal.

Conclusion. Supraorbital craniotomy can be an effective and safe alternative to classic approaches to treatment of extra-axial tumors of the anterior cranial fossa and intra-axial tumors of the frontal lobe. The approach requires a very careful selection of patients, individualization of surgery, and further critical evaluation. 

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