The saccular duct and endolymphatic sinus run in the bony groove, before reaching the orifice of the vestibular aqueduct. We first clinically visualized this sulciform groove using three-dimensional (3D) cone beam CT images. This strategy can be useful to assess the condition of the saccular duct and endolymphatic sinus concerning the longitudinal flow system of endolymph.
Yamane, H., Takayama, M., Sunami, K., Sakamoto, H., Imoto, T., & Anniko, M. (2011). Visualization and assessment of saccular duct and endolymphatic sinus. Acta Oto-Laryngologica, 131(5), 469–473. https://doi.org/10.3109/00016489.2010.533697