• Nunes Cristian Ferrareze CF Department of Neurosurgery of the Fluminense Federal University, Nitéroi, RJ, Brazil. cristian.nunes@gmail.com. , Daniel Monte-Serrat Prevedello, Ricardo Luis Carrau, Clóvis Orlando Pereira da Fonseca, and José Alberto Landeiro.
• Department of Neurosurgery of the Fluminense Federal University, Nitéroi, RJ, Brazil. cristian.nunes@gmail.com.
• Acta Neurochir (Wien). 2016 Feb 1; 158 (2): 319-24.

BackgroundThe medial opticocarotid recess (MOCR) is located in the posterior wall of the sphenoid sinus, medial to the junction of the optic canal (OC) and the carotid prominence (CP). There is controversy in the literature in relation to the presence of the MOCR and its constancy, which is relevant when approaching the skull base through an endoscopic route.MethodsThe morphometric relations of the MOCR with the surrounding structures were studied in 18 cadaveric specimens after endoscopic endonasal approach (EEA).ResultsThe distance between both MOCR was 11.06 ± 1.14 mm; the distance between the MOCR and the lateral opticocarotid (LOCR) recess was 5.56 ± 0.85 mm; the distance between the MOCR and the suprasellar recess was 3.72 ± 0.49 mm; the angle between the MOCR plane and the OC 13.32 ± 2.30°; the angle between the MOCR plane and the CP 13.50 ± 2.68° and; the angle between the OC and the CP 26.81 ± 4.26°. All measurements showed low variability, with low standard deviation and interquartile range. No relations were found between any of the measurements.ConclusionsThe MOCR may be used as a reference point for precise location of structures during EEA. Objective measurements may be especially useful in cases with distorted sphenoid bone anatomy.

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