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The types of vascular corridors oblique lateral interbody fusion (OLIF) at L5–S1. (A) A wide vascular corridor with no structures obstructing the L5–S1 intervertebral disc (IVD) access. (B) A difficult type of vascular corridor due to the left common iliac vein covering the left half of L5–S1 IVD with no fat plane between the vessel and IVD. (C) Another difficult type of vascular corridor with no accessible window for the whole length of L5–S1 IVD.
