Method and articles for treating the sinus system

A method of treating a sinus cavity of a subject comprising

• advancing a distal portion of a light source through a drainage pathway of a frontal sinus cavity of a subject and into the frontal sinus cavity;
• visually observing a transdermal light emitted from the distal portion of the light source in the frontal sinus cavity;
• advancing a distal portion of a substantially rigid inner guide member of a balloon dilation catheter into the drainage pathway of the frontal sinus cavity, the balloon dilation catheter including a movable shaft slidably mounted on the substantially rigid inner guide member, the movable shaft including a balloon;
• advancing the movable shaft and balloon distally over the substantially rigid inner guide member to place a portion of the balloon in the drainage pathway;
• and
• inflating the balloon.