The lateral wall is formed by the greater wing of the sphenoid bone and the cheek bone (zygomatic bone), while the medial wall is formed by the lacrimal bone, ethmoid bone, upper jaw bone (maxillary ...

Figure 1 Periapical abscess from upper left molar. Figure 2 Possible routes of spread of periapical infections from ... Computed tomography (CT), panoramic dental x-ray (orthopantomogram, OPG) and ...