Catheters useful in the identification and treatment of bodily passages, such as sinus cavities, are provided. A catheter includes an elongate main body defining an inflation lumen and an optic lumen, an inflatable balloon attached to the distal end of the main body, and a fiber optic disposed in the optic lumen. When connected to a light source, the fiber optic emits light radially along a portion of the balloon and axially from the distal end of the main body. Methods of identifying and treating bodily passages, such as sinus cavities, are also described.
