A method comprises providing a balloon catheter device locating a balloon portion within a paranasal sinus ostium while the balloon portion is in the first position such that a distal end of the balloon portion is at a distal end of a paranasal sinus ostium inflating the balloon portion while the balloon portion is located in the paranasal sinus ostium such that at least a portion of the paranasal sinus ostium is dilated sliding the balloon portion back to a second position while leaving the distal end of a guide member at the distal end of the paranasal sinus ostium and viewing an image provided by a camera to determine whether an entirety of the paranasal sinus ostium has been dilated.
