Fig. 1

Preoperative facial image and head computed tomography (CT) images. (A) The patient’s facial image indicated redness and swelling on the left side of the face with conjunctival congestion in the left eye. (B) Axial section’s projection of the neck and (C) three-dimensional reconstruction of neck vessels. The red arrow indicates the fistula orifice and the white arrow indicates a metal foreign body, which punctures facial arteries and veins and heades toward the mastoid process without injuring the neck vessels