Which color line corresponds to the cyst of the maxillary tuberosity extending into the maxillary sinus?

• A. Red Line
• B. Green Line
• C. Purple Line
• D. Light Blue Line

Answer: (A)

When a cyst begins in the maxillary tuberosity and extends into the maxillary sinus, its defining radiographic feature is a radiolucent area that travels from the posterior upper jaw into the sinus, crossing the sinus floor. The color line that traces this path—the one following the lesion as it enters the sinus—best represents the extent of the cyst. In this case, that is the red line, which marks the lesion’s trajectory into the sinus.

Other colored lines typically highlight different anatomical boundaries or structures and do not show the cyst invading the sinus, so they don’t reflect the path of the pathology. This distinction helps clinicians assess how far the lesion has extended and plan management that may involve the sinus.