Possible lung cancer??

In March of 2002 I had a chest X-Ray which showed some heaviness in the upper right area of my chest. From that, I had a CT scan and it was found there was a 6 X 9 mm nodule in the upper right apex. I was instructed to have another CT scan 3 months later which I did, and the results showed the same (no change). I was also told it was not calcified although I don't quite know what the significance of that is. I was told it would probably be best to check it again in 3 months, however we moved and I never got around to getting another check. About a week ago (10/14), I had a routine chest X-Ray which the radiologist (totally different radiologist in a different state) stated in his words, "there is the presence of an ill-defined nodular density in the right pulmonary apex." From that another CT scan (with contrast) was ordered which I just had done yesterday. (The results will be sent to my Doctor). I am very afraid of what will come back and I'm just trying to calm myself until I hear from my doctor which will probably take another couple days. As far as any symptoms, I really don't have any. I feel great, no noticable symptoms except for an occassional sharp pain in the upper right area of my chest about 2 " to the right of my nipple. This comes & goes and sometimes doesn't re-occur for months. I am a male, 55, former smoker (I quit 4 years ago). My question is this: are all nodules like I've mentioned always cancerous? Any info would be greatly appreciated. Thanks....
Ken