Morphometric Study of Endoscopic Transoccipital Approach to Lateral Ventricle With Magnetic Resonance Imaging

Endoscopic surgery has been applied in the treatment of lateral cerebral ventricular lesions for years, but few morphometric studies in vivo have been reported with medical imaging. In the current study, the authors aimed to investigate the related morphometric data of endoscopic transoccipital approach to lateral ventricle with the magnetic resonance images of lateral ventricle from healthy adults anonymously. Seven parameters on the axial plane and 3 on the left occipital horn of sagittal plane of T1-weighted image were measured and the results were as follows: The distance from incision to the cranium posterior intersection with midsagittal line (D1) was 29.69 ± 3.09 mm.The distance from incision to the superior border of transverse sinus (D2) was 29.40 ± 4.76 mm; the length between incision and the entry trajectory intersection K of posterior wall of lateral ventricle (D3) was 43.25 ± 4.20 mm; the distance between the midpoint of largest width of occipital horn and the intersection K (D4) was 9.39 ± 2.75 mm; the bilateral occipital horn and left frontal horn (W1, W2, W3) were, respectively: 10.29 ± 2.27, 9.74 ± 2.51, and 7.91 ± 1.19 mm. The angulations between entry trajectory and the projections of longitudinal axis of posterior lateral ventricle body that goes through the midpoint of largest breadths of left occipital horn on the axial and sagittal planes and the longitudinal axis of temporal horn (A1, A2, A3) were separately as follows: (38.10 ± 4.50)°, (30.30 ± 4.47)°, and (31.08 ± 4.54)°. The resultant anatomical data of the distances and angles validate the previous surgical experience and, moreover, facilitate neurosurgery to the lateral ventricle through the endoscopic transoccipital approach.