Figure 1b. Squamous cell carcinoma of the right buccal vestibule. (a) Axial CT scan shows a tumor (arrow) but does not clearly demonstrate which wall is involved. (b) Axial CT scan obtained with the puffed cheek technique shows involvement of both the buccal mucosa (white arrow) and the gingival mucosa (black arrows). (c) Coronal reformatted image obtained with the puffed cheek technique shows involvement of the right cheek (white arrow) and the gingiva (black arrow). * = buccinator muscle.