Figure 9. Image 6 mm forward of Figure 8 shows therelationship of the roots of the molar teeth to the floor of the maxillary antrum and the mucous retention cysts (benign mucosal antral cysts) on the floor of the antrum. The low signal from the cortical bone forming the floor of the maxillary antrum is seen sinuously passing over the contours of the apices of the molar teeth.