Figure 1. (A) Axial magnetic resonance image (MRI) of the cervical region showing the large artifact attributable to ferromagnetic interference. (B) Result of a repeated MRI using the same image plane and MR technique as in A. The pilot balloon has been attached to the y-connector of the ventilator tubing, eliminating the ferromagnetic image distortion. A = anterior; R = patient's right; arrow indicates the spinal canal.